[¶1] Larry Keever purchased a car from Payless Auto Sales, Inc. (Payless) and agreed to make three monthly payments and a balloon payment to pay off the purchase price. He failed to make the scheduled balloon payment and instead continued to make monthly payments, which Payless accepted. However, he stopped making payments before paying the full amount required by the agreement. Payless sued Mr. Keever for damages pursuant to the agreement. Mr. Keever argued the contract had been modified by the conduct of the parties, but the district court disagreed and awarded damages to Payless. We affirm the district court's judgment.
ISSUES
[12] Mr. Keever presents the following issues: 1
I. Whether the trial court's factual determination was clearly erroneous and/or contrary to the great weight of the evidence in that the contract between Defendant and Plaintiff was not modified by the payment and acceptance of monthly sums versus previously agreed lump-sum payment{[?]
II. If the contract between the Plaintiff and Defendant is found modified, whether such modified contract needs to be reduced to writing with such writing or "modified contract" having to include required consumer credit disclosures{?]
III. If the "modified contract" between the parties needs to be in writing and contain the appropriate disclosures, whether the failure to do so renders the contract void as against public policy and/or void for illegality[?]
FACTS
[13] In 1996, Mr. Keever purchased a 1991 Chevrolet Lumina van from Payless. He signed a Credit Sale Note/Disclosure/Security Agreement for the purchase price of $13,615.92, which incorporated a Chevrolet Geo as collateral. Pursuant to the contract, Mr. Keever was to make three monthly payments of $250.00 beginning November 1, 1996, and a balloon payment of $13,478.62 on or before February 11, 1997. The annual percentage rate on the contract was eighteen percent (18%). Mr. Keever never made the balloon payment, but continued to make monthly payments, which Payless accepted for over three years until early 2000. James Ditzel, owner of Payless, testified at trial he continued to "urge" Mr. Keever to make the balloon payment. After February 3, 2001, Mr. Keever stopped making payments to Payless despite the fact he still owed money on the contract.
[T4] On October 831, 2001, Payless filed suit against Mr. Keever 2 . In response, Mr. Keever claimed Payless' acceptance of his monthly payments constituted a modification to the contract. Following a bench trial, the district court found the terms of the contract had not been modified, and "defendant simply chose not to make the payments as scheduled." The court also found the terms of the contract were properly disclosed, including the provision that late payments would increase the finance charge.
[T5] This appeal followed.
STANDARD OF REVIEW
[16] Our review of the trial court's factual determination that the terms of the Credit Sale Note/Disclosure/Security Agreement had not been modified is limited. Findings of fact will not be set aside unless the findings are clearly erroneous.
"When a trial court in a bench trial makes express findings of fact ..., we review the factual determinations under a clearly erroneous standard[.]" Rennard v. Vollmar,977 P.2d 1277 , 1279 (Wyo.1999). This court does not weigh the evidence de novol.]
Ruby Drilling Co. v. Duncan Oil Co.,
[T7] We do not substitute ourselves for the trial court as a finder of facts; instead, we defer to those findings unless they are unsupported by the record or erroneous as a matter of law. Life Care Centers of America, Inc. v. Dexter,
DISCUSSION
[18] Mr. Keever asserts the Credit Sale Note/Disclogsure/Security Agreement he signed was modified by the subsequent conduct of the parties. The conduct he relies
Q. Looking at this, in February, Mr. Keever was supposed to make that large balloon payment.... [Dlid he actually make that payment in February?
A. No, he didn't.
Q. What did he do?
A. Just continued] to make payments looks like 250, 250, 250, then went to 300.
Q. So instead of making the balloon payment, he continued to make payments in the amount of $300 a month?
A. Yes.
Q. And those payments continued to accrue interest at the note rate?
A. Correct.
Q. And you accepted those payments?
A. I did.
Q. Why did you do that?
A. That's all I could get. In fact, we urged him to make that balloon payment but we were always given several exeuses: the bonus check never came in; the refund check never came in, etcetera, etcetera. So over time, we just accepted what we could get.
Q. So that was a business decision you had to make?
A. Yes.
[19] Following his direct examination, Mr. Ditzel testified to the following on cross-examination:
A. _... I know that in my notes I continued to try to get the balloon payment and that he had made several promises on his-that when he got his bonus check, that he would pay the account off.
Q. And when it became, as you basically stated earlier, that it was apparent that that wasn't going to happen, did you feel compelled at that time to maybe have Larry come in and enter into a new contract?
A. No.
[[Image here]]
Q. Was there a reason why you did not? When it became apparent that Mr. Keever was not making that balloon payment, why did you not have him come in and execute a new contract?
A. We had a contract.
[110] Mr. Keever did not rebut Mr. Dit-zel's testimony and provided no explanation for his failure to comply with the contract. He testified:
Q. Isn't it true you didn't comply with the terms of this note?
A. He wrote-yes.
Q. You didn't make the required payment of $13,000 and change in February, did you?
A. That's correct.
[111] Following the trial, the district court took the matter under advisement, and on November 19, 2002, issued a Decision Letter making the following findings:
Defendant argues that the contract ... was modified to include the $300 monthly payment term. Defendant asserts that the new terms should have been in writing and that he should have been given the finance disclosures required by law concerning the total amount he would have to pay.
The Court finds that the terms of the contract were not modified. Defendant simply chose not to make the payments as scheduled. The Court also finds that the required finance terms were disclosed, and the contract states that late payments will increase the finance charge that is paid.
Accordingly, the Court finds that Plaintiff should prevail ... and will be awarded the stipulated amount of $12,089.89.
[112] This Court has previously acknowledged that the parties to a written agreement may orally waive or modify their rights under the agreement. Shawers v. Board of County Commissioners of County of Sweetwater,
[113] Wyoming law is clear that the party asserting a written agreement was
[T14] In order to prevail on appeal, Mr. Keever must overcome the onerous burden of persuading this Court that the district court's findings are clearly erroneous. May-cock v. Maycock,
[T15] A contract modification requires the same mutual assent necessary for the formation of the initial contract. As stated by the Kansas Supreme Court:
It is well settled that the terms of a written contract may be varied, modified, waived, annulled or wholly set aside by any subsequently executed contract, whether such subsequently executed contract be in parol or in writing. (Gibbs v. Erbert,198 Kan. 403 ,424 P.2d 276 ; Bailey v. Norton,178 Kan. 104 ,283 P.2d 400 . One party to a contract cannot unilaterally change the terms thereof. Modification requires the assent of all the parties to the contract. Their mutual assent is as much a requisite in effecting a modification as it is in the imitial creation of a contract.
Fast v. Kahan,
[116] Affirmed.
Notes
. The appellee did not file a brief in this matter.
. The original complaint asked for judgment in the amount of $6,615.67; however, the complaint was later amended and requested judgment in the amount of $12,300.51. During the bench trial, the parties agreed on a stipulated amount of $12,039.89.