Charging for closed account - threaten with blacklist

<p>I have cancelled my main account with Vodacom in August 2016, only leaving a 1GB account. I have since been charged with costs related with my old account. I have phoned the call center about 20 times to resolve the matter with no luck. After that I was being threatened with black listing. They offered a 10% discount on the outstanding amount which I then agreed to pay as nobody at the call center could help. Then the month thereafter I received another account for the 10% discount I did not pay...</p> <p> </p> <p>Now I am being threatened with Black listing again, I have phoned the call center again when their systems went offline - with the agent promising to phone me back - which of course did not happen.</p> <p> </p> <p>I would like to resolve the issue and is willing to pay for anything legitimate, but their call center is full of *********** resources that can’t resolve anything!!</p>