If you have questions or are due a reemployment tax refund, contact the Department's Refund Process at 850-617-8585. Documentation Required.Thank you for completing this Overpayment Refund. Over Payment Refund Letter To Customers Template. Overpayment response. Report an overpayment. Complete an overpayment refund form to notify First Coast of an overpayment prior to receiving a demand letter. Please download the form, complete each field and print. Include the form with your refund so we can properly apply the refund and record the receipt. When you identify a Medicare overpayment, use the Overpayment Refund Formto submit the voluntary refund.