The clause of the insurance policy, designated as (a) is devoid of ambiguity. The act of the insurer, that is, the effort to collect unpaid portions of the premium represented by notes, was a matter subsequent to the issuance of the policy and does not fall within that class of eases where the acts were done previous to or simultaneously with the issuance of the policy and were held to be waivers. Johnson v. Ætna Insurance Co., 123 Ga. 404 (
