think ill buy out

I made a huge mistake and took out a contract with MTN.this contract was activated at the mall in Jabulani and the guy was very helpful I was even impressed by his service only to find out he was more concerned about his sale..At 1st they debitted my account and It was successful however they stopped debiting for what so ever reason.Being the customer I am I then visited westgate MTN where I was told my acc is handed over my question Is why and whose fault was it? MTN slap tiger please sort this mess and im really not willing to pay a single cent as it was never my fault.call me on ***