Refund For Wrong Product

Dear ____ (name):
We are in receipt of your letter regarding the merchandise purchased _____ (time)
and then returned. You noted in your letter that one of our store associates had
made a mistake and you received the incorrect package. As you can imagine, we
deal in a high volume of sales. Therefore, occasional errors such as the one you
experienced do occur. However, we are proud of the fact that these errors are few
and far between in number.
We are enclosing a check for the full amount of your purchase. Your patronage is
highly valued. Please drop in again and let us see that your next purchase is
handled correctly.