假定你是李明，根据下面的内容写一封投诉信
1.昨天在超市买的空调不能正常运作；
2.要求超市及时提供解决方案，如果不能修理好该空调，将要求退款；
3.写信日期：12 月 18 日。
注意信函格式！
范文:
December 18
Dear Sirs,
I’m writing to you to complain about the air-conditioner I bought in your supermarket
yesterday.
Unfortunately it doesn’t work properly. I’m really disappointed at the poor quality of your
products. So I hope you can take immediate actions to deal with this problem.
If the air-conditioner cannot be fixed well, I demand a full refund.
Sincerely yours,
Li Ming
