worst service

I had called in to cancel my contract as the contract had expired. consultant confirmed that the contract has been cancelled and that they will no longer debit me. Vodacom kept debiting me after cancellation, I then sent them an email to send me a cancellation letter. I spoke to a consultant who told me I was owing money which I am not. I had paid my contract in full then cancelled. I kept talking to a number of people who said they will give me feedback but never did, I kept sending emails for feedback but never got a response. the only thing I received was a document stating that I owe R0.00, now I got a call from some legal department and they said my account has been handed over and I should pay R500 and something. I explained to them what had happened and I was still given another number to call , this up and down with vodacom is not resolving my query till today.