Formal Letter

Dear Mr Cooper,
                             I am writing this letter to inform you that my friend Steve and I want to keep the machine you sold us last week.
                          I know that it is a crazy idea to keep it because you thought that it didn´t work so well.But it does. If you agree with me, come at midnight. My address is 4008 Gorriti  street. But if you don´t agree, you will give me again what i paid you and ,obviously, an extra price.
                          You can give me the money tomorrow because if not, I won´t accept it. My mother is in my house at midnight so don´t give anything to her please.

 Look froward to your replay.
Best wishes.

Max.