Dear …
RE: Refund Request for Returned Product - __(reference #)__
Please find enclosed a __(product name)__ that we are returning to your company for a full refund. We purchased this item from you on __(date)__. Once we had the opportunity to try it, we realized that it does not meet our needs at all. As we are unable to use this product, we are returning this it for a refund.
Attached, please find a copy of our receipt of purchase. Kindly forward a refund for purchase price of __($amount)__ to __(name of company and address). Thank you. We look forward to receiving our refund soon.
Yours truly,