【正确答案】Dear Sir，
Yesterday I bought a mobile phone that cost me 1，600 yuan in your suppermarket．But today I found it did not work and it could not come into use．I am very angry with that because I must use it to deal with much business．Therefore，I am writing to ask you to accept return or to replace it with another one as soon as possible．
I trust you will consider this matter seriously and make an effort to prevent the reoccurrence of such things．I would appreciate your help in dealing with this matter．
Many Thanks．
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Yours
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Li Mjng