Vodacom cancellation department not doingthier job

Hi am a vodacom customer for years but I have a problem cancelling my contract I have been calling since January to cancel the contract as it expired on october 2014 I spoke to a consultant on december they told me is cancelled on january they say am owing them cause the contract is not cancelled I then pay the money and ask fo assistant to cancel I called *** they told me is cancelled I called again end of February since my money was taken they again told me I didnot cancel I call again to cancel last month again which is april same thing up until today the contract is still not cancelled accourding to call centre111 what do I do now cause they say calls are recorded yet everytime hen you call is like they have no idea but your money is taking every month for a contract you no longer want I dont want anything to dowith vodacom period