Can't cancel Vodacom contract

I had a contract with vodacom I completed my 24months contract called in to cancel contract forced to take another contract as I would loose my number I told the the guy I wanted prepaid he insisted called back to cancel the contract immediately after as I received messages of a contract which I didn't want I was told to continue contract can be canceled in 30 days only. Thereafter money was debited from my account I called again as my initial debit of R500 was taken off they said that the new contract will be canceled I will recieve a message. To my surprise 1st December debited again called in I'm not even sure what I'm paying is it data or airtime as I have not received anything only the prepaid airtime I've bought and data I've bought. Called after 2nd debit told I must go in to vodacom to pay money ( for what service I don't know) then I must email proof of payment. I can't cancel this contract as I will go back into my old contract will be debited R500 again then I will have to recancel that contract. I must pay for a device that I've finished Anyways I just wanted to be done with vodacom I went into pay was advised that there were other clients in the same situation I must call *** to reverse and cancel and get prepaid when I call while In the store call was cut. I then called again 7 December 22, was told another story again that I'll be debited my initial amount. I asked for a manager as I was fed up of getting a run around he says it's been reversed but I don't think it's true no details checked and who reversed it when everyone says it's impossible to reverse. Vodacom keeping people hostage never ending contract I don't even know what to believe as the call center agents are very untruthful and behave like forceful ****s.