我在考英语,写作文,你刚收到订购的一件商品,但发现质量问题,请你写一封投诉信,必须有商品的

Dear Sir or Madam,
I am a customer who bought a SO200 type cell phone from your company on 2010-9-1.I am afraid I really must complain about the quality of this product.
After using the cell phone for two days several problems have been found.First,the cell phone could not send text massages any more.If I sent massages,it would suggest that there were some problems with the cell phone,which have made a lot of trouble to me.Second,the camera couldn’t work as well as before.As soon as I took pictures,it would turn into black color and there were no pictures kept in the picture files.
This kind of problem caused me a lot of troubles.I have gone to your company to explain the problem twice.But because of some reason,the problem has still not been solved.
I prefer to tell you directly in the hope that you will do something to solve my problem.I will be appreciative if you either make a refund or sent me a replacement.
Thank you for your attention to this matter.I am looking forward to hearing from you in the very near future.
Sincerely
Yours,
Li Yuan