(your street city, state, zip) (date) (name street city, state, zip) Dear _____ (name): I am sorry you had to wait such a long time for your credit of _____ (amaount of money). We have had trouble tracing your sale and the return of part of the merchandise. The refund check has now been mailed. Again, thanks for excusing the delay. Sincerely yours, (name) (title)