The amount contributed to an account for a designated beneficiary in the program shall not exceed the amount established by the Comptroller pursuant to section 84.09 of the Mental Hygiene Law. The program manager shall monitor contributions so as to prevent contributions to any account for a designated beneficiary when such contribution would cause the amount of money in such account to exceed this amount. Any amount tendered as a contribution, or portion of a contribution, that if accepted as a contribution would cause the amount in any account to exceed this amount, shall be rejected as a contribution and shall be returned to the contributor.