Letter of Complaint

Dear Sir or Madam,
　　 It is with great reluctance that I must 1*I am writing to inform you that the iPhone I bought from your store last week does not operate work properly. Dduring the five days I have had it in my possession problems have emerged one after another which are quite annoying.
　　Although I was initially pleased with the phone,I quickly changed my mind.To begin with,the battery is distressing 2* frustrating as it merely supports the phone of for 2 hours of use.This is means I have to carry my charger with me for a day out.In addition,it happens when I am making a phone call with friends it suddenly ends up the call that made me which makes me appear impolite to friends. This which is unacceptable for me for as I just bought it five days ago under warranty.
　　Therefore,I would3* like to either change it for a brand-new phone with qualified quality or get a full refund for the phone.I will appreciate it if my problem receive due attention and I look forward to your reply at your earliest convenience.
　　　
Yours truly,
Li Ming

I'm practising for the composition,thanks for your generous help. Vera

1* This isn't really appropriate for a complaint and would be more suitable for an apology.

2* not a good word a phone in a formal context.

3* In a complaint in this circumstance you should be stronger here. I must insist you change it..  , I demand you change it..., etc.

Although you have some errors the general level of correction is good. Sentences should be separated better. But some epressions are excellent and give a very good overall impression.