Overpayment refunds of vehicle and business tangible property taxes will be sent within 2 to 4 weeks from the date of the payment or exoneration. Over Payment Refund Letter To Customers Template.Clearly state the decision regarding the refund. We hope this email finds you well. Call Inova customer service at 571-472-5750 for assistance with bills from any of our Inova hospitals and the following services. We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error. First, you need to issue a check to your customer using the Accounts Receivable account for the overpayment amount. If your refund was reduced to satisfy a Virginia Tax debt, and you have any questions or disagree with the bill, please contact Collections at 804.367.8045.