Looking for an English composition

Dear Sir,

I'm writing to you for the mobile phone of Dephone-S250 I bought on 20th Feb.2009 at Tele Mall in Wuhan.Ten days after that, it didn't ring and send short messages.Then I took it to the seller, but I was told that the model had been sold out and I had to wait at least three months for a new one.Later I went to the repairman.He said since it was a new model in China, it was impossible to fix it without the right spare parts. I was so desperate on hearing that. How can I wait that long? Therefore, I require that you send me a new one of the same model within a month.

Thank you for your consideration.

Sincerely

LiMing