Hogy kell írni angolul a panaszlevelet (letter of complaint)?

példa:

Dear Sir/Madam,

I am writing to complain about a telephone bill that I received today.

Generally my bill is approximately $100, however, the bill I received for the last month was for $252. It

seems to me that there must have been some sort of error made by your computer. Therefore I would be

grateful if you could check this for me.

I would appreciate a reply by return of post if possible as I am anxious to solve this problem.

Yours faithfully,

Alex White

1.vagyok

szólj ha valami nem tiszta a levélben.(szófordulat,szórend stb..)::)