Direct Deposit is the safest and fastest method to receiving a refund. Clearly state the decision regarding the refund.To obtain an overpayment refund, complete and sign the Application for Tax Refund. You may fax, mail or email the request to the Refunds Department at:. Dear Customer: Enclosed with this letter you will find a refund check from Minnesota Energy Resources. This refund represents the resolution of a disputed claim. An erroneous refund is defined as the receipt of any money from the Service to which the recipient is not entitled. Over Payment Refund Letter To Customers Template. Edu or taken to a Student Financials campus location.