An overpayment can happen if there is an ineligibility notice, which disqualifies a claimant in certain cases where they have already received benefits. Report an overpayment.Complete an overpayment refund form to notify First Coast of an overpayment prior to receiving a demand letter. 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. A detailed explanation of how the refund amount was computed;. • The specific reason(s) for the refund request;. Once the Cost Containment Unit (CCU) has reviewed the overpayment, you will receive a letter explaining the details of the reconciliation. You have to tell your credit or debit card company about any error you're disputing within 60 days of when the first statement with the charge was sent to you. You must allow them 45 days in which to respond before requesting a refund from Broward County.