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 document template is designed to make the process of writing an "Inform a Customer of an Overpayment" letter quick, easy, and stress-free. In this article, we'll provide tips on how to handle refund request letters and 7 sample templates you can use to get started today! The salary overpayment resulted because . A refund letter to a customer should be structured to convey the necessary information clearly, empathetically, and respectfully. We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error. Our service provides various examples of refund letters, including sample overpayment letters, refund request letters, and more. How do you write a letter to inform of a double payment?