charged me for a cancelled contract

I cancelled my contract on the 09/07/2014 I received a SMS and a call from vodacom to confirm my cancellation but my bank account has been debited every month for the contract I have not been using the number and I have not been geting stations from vodacom for the past 3 years so wen I upgraded on my existing contract in February 2015 I new what the amount must be that that must debt so wen my 1st payment went of I noticed it is not the right amount but thought it up upgrade fees but when the second 1 went of that is when I called vodacom then the man told me I have 2 contracts on my name so I told him it can not be I cancelled my 1 contract in 2014 so I asked for my money back for the 8 month since I was not using the number and it was them that did not deactivated my account and I what the money back in to my a count so he told me it will take 48 hours and that was on the 3 of March 2015 an I am still wating for the money been calling every week and every time it is a different person that I speak to and every one is telling me a different story vodacom ows me R800 got a SMS to say that they are going to credit my vodacom account with R600 but on my account ,not bank!I