What regulations are you referring too? This is not a deposit account, it is a loan. If the ACH or check paid off the loan - why in the world would you not have just returned the check or ACH? No one noticed this when processing the pay-off? Even if they posted the same day, someone had to notice this the next day and one entry should have been reversed and returned.
Reg Z, credit balances 1026.21. I agree, it should have been caught, and I'm looking to determine how it wasn't. But, it wasn't. It was applied and created a balance on the consumer account. Then, our refund process kicked in and the balance was refunded to the consumer as described in the regulation.