关于手机英文投诉信

Dear sir or madam:;
I'm writing to complain about the bad qualities of mobile phones.
In may this year in the store to buy a new phone, use less than a week will fail, the two have maintenance, still can't normal use.
In short, in view of this situation, my application or a refund.
Hope you cause enough attention to this matter.

Sincerely,

Letters of Complaint
to the company,
hello, I'm a consumer and i bought your mobile phone before. But the moblie phone has something the matter. first, it has weak signal. Second, it has low volume. So i want you can solve this problem, thank you.
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