Our document template is designed to make the process of writing an "Inform a Customer of an Overpayment" letter quick, easy, and stress-free. This brief but important letter notifies a customer that he or she has overpaid you.It can serve as a very good customer relations letter. Our service provides various examples of refund letters, including sample overpayment letters, refund request letters, and more. The salary overpayment resulted because . Overpayments: There are occasions when customers might accidentally overpay for a product or service. We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error. The Security Cooperation Billing Handbook is intended to provide insights and references on Security.