We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error. To manually report an overpayment claim or to report an offset due to a restored benefit on a case with an existing claim.Attach a completed and signed Form. 50-162, Appointment of Agent for Property Tax Matters, if the form has not been filed with the appraisal district. Below is the text of a sample notice letter that would need to be modified to fit the specifics of your complaint. In this article, we discuss how to write a demand letter, what to include in a demand letter, and provide a Texas demand letter template. Complete this form if any of the following applies: You think that you are not at fault for the overpayment and you cannot afford to pay the money back. •. Enter the total amount refunded to BCBSTX.