Another Vodacom ghost number victim

I have fallen prey to the Vodacom ghost number *****. As documented by so many other online complaints, Vodacom adds a number to your account after you port to another service provider. They then bill you for this number until you realize you are being de*****ed. I managed to reverse the debit orders and block Vodacom at my bank and after some difficulty finally managed to cancel the ********** number. Now Vodacom is threatening to black list me for not allowing them to ***** from me. To add insult to injury they expect you to prove to them that you did not sign up for the ghost number, instead of providing you with the proof that you did. You are expected to send an affidavit, and sample signatures to them. So they can forge the documentation? And then it is very difficult to get them on the phone as they only provide numbers that can be called from a Vodacom phone and never return your calls. If I did this to my clients, I would be out of business. Imagine how many thousands of their victims don't have the means to fight them and just let this happen!