Vodacom not cancelling my expired contract after numerous requests

I regret so much even signing up for a contract with vodacom. I had two contracts that was identical. Taken out at the same time. Both contracts came to an end by end of November. I have made numerous unsucessful calls to vodacom as the one contract has been cancelled and the other has been moved to a sim only deal which i nevee authorized and have in every phone call confirmed that both numbers must be cancelled. This is totally unacceptable as it keeps getting debited from my account. And every time i phone in. It takes forever to actually speak to a consultant that can assist and seems like all these phone calls are a waste of time as nothing changes . Vodacom needs to cancel this contract and refund me my money. Surely there must be something wrong with your systems or with the way you train your call centre agents.