Dear Felix
In reference to your letter of [date], we have no record of having received the merchandise you returned.
In order to issue you a refund $ [dollar amount], we request that you provide us with the following information:
1. Date you returned the merchandise
2. Form of shipment (UPS, Post Office, etc.)
3. Copies of any correspondence to us in regard to returning merchandise.
Your cooperation in this matter will enable us to trace the parcel.
Thank you for your help. I will be looking forward to your letter.
By:Lydia