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. This sample letter has choices to help you build your letter. When you write, pick the words that describe your situation. The salary overpayment resulted because . In this article, we'll show you how to write a refund request letter template that not only grabs attention but also persuades companies to act in your favor. Many times when a third-party payer mistakenly pays a dental provider, the payer will request a refund of the overpaid amount. Tell them that they have "overpaid" you. Then ask them to ring you for details.