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.The salary overpayment resulted because . If the overpayment is a result of a out-of-home placement in a facility: Complete the SCD 13 and document in a CalSAWS journal entry. You have 90 days from the date of the written notice to appeal your case. The letter should explain why you are claiming the refund and the amount of money you are asking the IRS to return to you. The CalFresh office has many ways of collecting overissued (overpaid) CalFresh benefits.