Amarelo=corrigir, Azul = melhorar

Complaint letter - cheque book *spelling alert - this looks great to me because I'm british but if you were in America I think you would need to write "check book"*

Dear Sir,

I am writing this letter because I am completely [or extremely] disappointed with your services.

Two weeks ago, I ordered a new cheque book. I went to the bank and I talked with Mr* Sanches, the little one [this sounds mildly insulting - I would say something like "a man of short stature" which is a bit formal, but if you need to describe someone's physical appearance it's probably best to be careful!] with long blond hair. He told me that in five days I would have my new cheque book in my house [or "he told me the new cheque book would be delivered to my house within five days"]. But it is now fifteen days later and nothing at all has happened. Therefore, I ask you how much longer I will have to wait for it and what will you do to solve the problem?

I really need it, I have plans waiting for it.

I will be waiting for your answer [or "reply"] to this letter as soon as possible. Can I count on you?

I look forward to hearing from you.

Yours faithfully.

Sr. Paulo [I'm not sure what the Sr stands for here - senhor?  I would usually use a full name with no title - Paulo Coelho ou seja o que for ]

*It's OK to use "Sir" on its own when addressing someone with higher social status - for example, "Can I help you sir" or "Please sir, may I have another" but you wouldn't use it with a name unless that person was a knight "Sir Gawain was on a quest to find the Holy Grail" or "Sir Michael Marmot is a professor of Epidemiology". In this case, Mr Sanches is probably not a knight, so he's just a plain old Mister