You do not need to respond to this letter. If you have an overpayment, it will be refunded in the method you requested.Complete the contact form page and attach a file for ONE of the following proofs of payment for each payment. The client will have 30 days from the date of the Overpayment letter to submit the request and supporting documents. When sending a refund check to us for an overpayment, it's important that you also include a completed refund form. Click here to search for any overpayments on your PIN. If we have identified an overpayment and request a refund, please mail the check along with a copy of the overpayment request letter we sent you. NOTE: Type directly into the required fields on the Overpayment Refund Form, then print. Illegible forms may cause a delay in processing. There has been an error in your favor!