How To Write A Letter To Airline For Refund . I purchased a [product name] on [date of purchase], and paid a total amount of [total amount]. As you can see from the enclosed withdrawal slip, i am within that limit. Lettering, Phrases and sentences, Career from www.pinterest.co.uk The specific problem with the product. Write and send your letter as soon as you decide you are dissatisfied with the transaction or delivery of products or services. Click “prepare my refund sample letter” below.