Formal Letter

Dear Mr. Stevenson,

I am writing this letter because I have some problems with the machine. I think that you made some mistakes that are unfair for me, for example the price.

First, I want to tell you that I am very disappointed because I thought that you were a little more intelligent. You gave me the machine in bad condition and more expensive that what it is. I will like to know if you did it on purpose. Because that is what it seems.

I would like to know if you could visit me so I could show you the problems, and if you could repair and give me the extra money I paid to you.

Your Sincerely 
Robert