I spent 150 Yuan buying a handbag in your company,but I found there's something wrong of the zipper when I got home.I hope your company could help to change or repair it for me.Thank you and waiting for your answering!
阐述拉链不能用的事实并要求厂方更换或维修,并等待回复.不过可能不算投诉信吧,这个问题不大,应该协商解决就可以了,
Good luck to you!