【正确答案】[范文]
Dear Sir,
I bought a TV set in your shop (No. 1 Department Store). Unfortunately, it has no sound and unclear picture. I called the Alter Sales Department several times but no one could solve it. I have to write to you to see to it. Please ask your staff to go to my home to repair it or to replace it or to refund it.
I look forward to your kind reply.
Yours sincerely,
Bob