An overpayment may occur when a claimant is paid unemployment insurance benefits and is later found to not be eligible for those benefits. 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. Providers have the option to submit a Request For Extended Repayment Schedule (ERS). A complete ERS request should be submitted immediately. If we have identified an overpayment and request a refund, please mail the check along with a copy of the overpayment request letter we sent you. When sending a refund check to us for an overpayment, it's important that you also include a completed refund form. Click here to search for any overpayments on your PIN. When you identify a Medicare overpayment, use the Overpayment Refund Formto submit the voluntary refund. The purpose of an overpayment demand letter is to notify the providers and suppliers of the existence and amount of an overpayment, and to request repayment.