Fill in the information needed, such as the Reference, Date Paid and Amount. 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. Phone number matched the one listed for DRG on the ed. The salary overpayment resulted because . If you think you have overpaid your Property Tax bill, you can contact the Finance. Department at (912)729‐5613 to see if you are entitled to a refund.