Steeling Money from my account without permission

And again my account is debited by vodacom for a contract that I dont even have. Everytime I phone them and tell them to stop the contract as the 2 year contract expired in October 2014 they tell me it has been done but I just keep getting billed over the thousands every month. I cannot do this anymore and cannot just stop using the simcard. This is completely pathetic. A bunch of ****** incompetant people if you ask me. And as far as I know it happens to alot of peopl. Im disguted in the lack of business sense honestly. I will go to court with this matter it is final.