Austin Parker,
1234, West 67 Street,
Carlisle, MA 01741,
(123)-456 7890
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Austin Parker,
We apologize for sending you a defective magazine. We have always been sending correct copies of the magazine but somehow you received a bad magazine. We are making sure that we send you a replacement right away. Ring us at 22-2222 if there is an issue with the delivery. We are thankful for your continued patronage.
Sincerely,
Adeben