Telkom Billing and Blacklist - Unfair practise

I cancelled my Telkom account in October and again in November. I have visited the store 48 times, and made over 210 calls to the call centre. They did not stop billing me. In order to prevent blacklisting, I paid the outstanding amount on this non credit, prepaid account. Telkom then did not cancel the service, they did not stop billing, and have now ruined my payment profile on ITC and Transunion. I have begged, cried and pleaded with Telkom to resolve this, but they refuse. The in store staff have laughed at me. I was in a serious accident and require urgent attention, but because of my blacklisting I cannot get finance. I am now wheelchair bound as a result of Telkom actions, and cannot get medical care I need. I have sent cancellations, visited the store 48 times, the store has sent the cancellation on my behalf, still no action, no contact, no results. I do not know where to turn. Please help!