I am writing to complain about the color TV set I have brought in your store several days ago. It worked well when I first used it. But yesterday when I ran it, there was no picture at all, which made me very annoyed. Since the color TV set has a one-year guarantee on its parts and workmanship, I would be grateful if you could send the repairman to my home to fix it. Please contact me about it at the earliest possible convenience. My mobile phone number is: 139********. If it is not properly settled, I would ask you to give my money back, or I would complain to the concerned authorities.
Looking forward to hearing from you as soon as possible.
Yours sincerely,
***(signature)
希望对你有帮助.