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. The Notice of Overpayment will include information on how to appeal. You must appeal the overpayment within 90 days of the date on the notice. A refund letter to a customer should be structured to convey the necessary information clearly, empathetically, and respectfully. The salary overpayment resulted because . An overpayment of benefits can occur for a number of reasons. Knowing how they can occur can help you avoid such a circumstance. 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!