模板2：
To Whom It May Concern，
I am writing to complain about the poor service of your I received when .
The reasons for my dissatisfaction lie upon three points as follows: 1) ; 2) ; 3) . Under these circumstances, I find it difficult to .
I am sure that you are able to thoroughly understand my discontent, which you are bound to replace with a satisfactory solution. I would be grateful if you could as soon as possible.
Yours sincerely,
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