Pathetic service, inconsistent information, rude call centre agents

In October 2016 I cancelled a previous Cell C contract because it was way too expensive and more than it was advertised for, I opened a new cell c contract (heaven alone knows why) and used a voucher which I was given as part of the new contract to go to Pick n Pay to pay the cancellation fee for the previous contract. In November I called the Call Centre to ask if there was any amount outstanding on my account. I was told that there was no amount owing and the old contract was closed. In June this year ( 8 months later!!!!!) I was called to say I owe Cell R2700 for the cancellation of thee previous contract. I said I would not pay it and that they need to find the recording of the call form November where I was clearly told that I did not owe money. Nothing was done and for more than a month I heard nothing. I called again in July to check what was going on and another call centre agent at customer care told me I did not owe money. I left it at that. On the 19th of August (Saturday) at 14:45 I was called again and told that I owe this money. I explained the whole situation the agent and said I wanted to speak to a supervisor. A supervisor called me back a few minutes later, I told the story again and was told that she would personally look for the recordings and call me back on Monday that 21st of August. I made a request that I only be contacted after 3pm as I do not want to be contacted at work. NO ATTEMPT was made to contact me until the 29th of August at which time I did not accept the call as it was during work hours and I had specifically requested not to be called during work hours. This continued intermittently for a few days. On Friday the 1st of September at 11:25 I called Customer Care, again asking if I owe any money. I was told by Prudence, on another call which I know was recorded, that I do not owe any money! Today, again during work hours, at 10:15 I was called to say that I owe money and that the account is four months in arrears (which is ridiculous because the account was cancelled 11 months ago, so if I was in arrears it would be way more than 4 months). I was also told that the account will be handed over to lawyers and my credit record may be affected. I asked what I should do as nobody has listened to all of these recordings where I was told that I don't owe money. I absolutely refuse to pay this money as I made a payment which should only have been allocated to the cancellation of a previous contract, if it was allocated to anything else I will not take responsibility as I in no way authorized this. I find this service absolutely appalling and after months of trying to reason with people over the phone and multiple requests for my recorded phone calls, I see no other way but to publicly complain.