unauthorised debit order

My vodacom contract ended the term September 2013. About 3 months after that I realised the debit order was still running. I contacted vodacom. They instructed me to terminate the contract at a vodacom shop. I proceeded to the centurion mall vodacom shop and terminated the contract and also didn't have a simcard anymore. A month ago I realised vodacom is still deducting R334,00 a month from my bank account. I contacted customer care, they told me how terrible my situation is and how sorry they are and that someone would contact me back. Nothing happened. I contacted them again numerous times but they were just useless. I then went back to vodashop in centurion mall, they told me to contact customer services, WHAT THE HELL!!! Must I go work at vodacom to empower myself to stop them from taking my money? Does vodacom think that because I didn't realise soon enough that they are ********ly deducting money from my account that it is just my loss? I want my money back!