Agreed on in August, the AU pays the amount owed to you and you to me posting the cassette. You deceived me? Why do not you answer my emails?
Agreed on is that I will I pay the amount due and you send me a tape.
You cheated me? Why don`t you answer my emails?
We had a deal, that I bank/pay you the money you wanted and you send me a/the tape. Have you deceived me? Why aren`t you answering my emails?

bank jest takie bardziej odnoszące się do wpłacania na konto :)