bad bad service

I went for new contract and when i received new contract phone when i put it on charge it was dead the next day as well so i took it back to shop where the assistent manager took the phone as well as the charger and plugged it in at the back of the store to see if they will be able to make it work I went back the afternoon and they told they need to send the phone in for repairs on which I told them to cancel the contract immediately. The next day the debit order for the contract was debited on my bank account so i went in to the bank to reverse it. The people did not want to cancel the contract because they told me that i did not hand in the charger....! but how did the charge the phone when the plugged in this is a joke and it is now my word against theirs! the operational manager told me he needs to look at the video tapes of that day to see what happens This is more than a month ago I still dont have a phone and pay now for a contract that I dont use at all!! month end my current contract amount as well as the one I stopped were debited against my account and the bank is not able to reverse the payment because vodacom done direct debit against my account!!!