BILLING AFTER CANCELLING MY CONTRACTS

I had two contracts with Vodacom which I SETTLED and moved over to PRE-PAID on the 21st of July 2014. I discovered in December 2014 that Vodacom had BLACKLISTED me on the ITC Credit Bureau for unpaid CONTRACT subscriptions. I tried contacting Vodacom and was told that lawyers were dealing with the matter and I must contact them (lawyers). The lawyers dragged their feet on the matter till I decided on 11 Mach 2015 to call Vodacom myself and do my own investigation as the lawyers were USELESS. Vodacom sent me my account statement which showed that they (Vodacom) continued billing me after I had settled my contacts. I then lodged a dispute with them (Vodacom) and the outcome of which was that the amounts I am being billed for every month post cancelling the contracts are for a handset. Which/whose handset this is I have no idea and they (Vodacom) and their learned lawyers seem not to be able to explain this, while my name continues languishing on the ITC blacklist for something which is clearly their (Vodacom) internal stuff up. I have explored all possible avenues to try and resolve this mess and no one seems to be able to resolve it including the one who put me in this mess (Vodacom