假设你是卜曼宜，你购买了一部某外国公司生产的手机，因有质量问题，要求该公司更换。请根据下列要点，用英文写一封电子邮件。
要点：1. 问题：手机不响铃，不能发短信；该产品已售完，无法更换；型号新，无配件，无法维修。 2. 要求：公司应尽快予以更换。
注意：1. 词数为100左右；
2. 参考词汇：配件-- spare part;
3. 电子邮件的开头和结尾已为你写好（不计入你所写词数）；
4.已给出的电子邮件的开头和结尾不得抄入答题卡。
Dear Sir，
I am writing to you for the mobile phone of Dephone-S250 I bought on 20th Apr.2008 at Tele Mall in Wuhan, P.R. China. Ten days after that, it didn’t ring and send short messages. Then I took it to the seller, but was told that the model had been sold out and I had to wait at least three months for a new one. I had no choice but to go to the repairman. To my disappointment ,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 for I can not wait that long. Therefore, I have to require that you send me a new one of the same model within a month.
Thank you for your consideration.
Sincerely yours,
Bu Manyi
把握内容要点齐全，语言要丰富，结构要合理。全文可以用一般过去时为基调，结合主动语态与被动语态，使文章结构完整严密。语言要地道而精炼。
