Check with your attorneys. This doesn't have to be completed today. See if this will work: sending the customers a modification letter stating the terms of the next loan "term" by certified mail, stating that making the next payment on the loan (or passage of a stated amount of time without objection) will be considered as acceptance of those terms.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8