We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error. The Probation Department will investigate your request and inform you if you made an overpayment and are therefore due a refund.Dropping classes or failing to attend can result in a financial aid overpayment. Initial Refund Response Letter Examples. Efficiently address and acknowledge customer refund requests with these response letter samples. The salary overpayment resulted because . B. Underpayment of Retirement Contributions By Members. 1.