求一篇英语书信作文,假如你是Tom Sminth,你刚买的空调出现问题,写一封投诉信

Businesses,
hello.
I am in the mall yesterday to buy an air conditioner.Today's air conditioning has stopped working for their own reasons.This is the quality of goods?This allows our customers are disappointed.I hope your after-sales staff to give me an explanation.
Thank you.
Tom Sminth

dear saler
yestoday i bought an air condition . But today it had some prolblem . It did not work well . I was so regret that it was not very good as i expected. So i want to replace it ...

Businesses,
hello.
I am in the mall yesterday to buy an air conditioner. Today's air conditioning has stopped working for their own reasons. This is the quality of