The answer to your question varies greatly depending on the method of payment to the bank. If you paid with cash and don't have a receipt there is very little recourse. However, if you paid with a credit card, or a check from another institution, there will be a record of payment somewhere. Also, is it the bank that is saying they were never paid, or is that what has been reported to chex systems? Often times the bank may have failed to report the payment to chexsystems. Thus, chexsystems reports an unpaid charge-off when it may actually be a case of the bank not updating the information. Either way, chexsystems will keep the report on file for a period of 5 years, whether or not it was paid.