How To Write A Refund Letter To A Client . Acknowledge their request, show some empathy, provide a concise explanation on why you cannot issue a refund (whether it’s old warranties, missing the refund deadline, the condition of the returned product, etc.), and offer an alternative solution, if possible. Keep a copy of the refund request letter and your transaction receipt for your records. Sample Demand Letter For Refund Of Money from mamiihondenk.org Make sure to show your customer that you’ve really investigated the case. Tips for writing a return of overpayment to client letter mention clearly about the details of the overpayment,.i.e., the date, the amount, the name of the seller they dealt with. Unfortunately, we won't be able to accommodate your request for (a refund, information, etc.)