Blacklisted despite WRITTEN confirmation

So...after 3 years of fighting, emails, calls and countless visits to Telkom outlets; I have now been BLACKLISTED!!!!!

1. I received confirmation of contract cancellation from Telkom 2. They still continued to debit my account despite cancellation and NO internet services 3. I have spoke to 3 of their Debt Collection companies 4. I don't have a Telkom account (have not since 2015)

No one is able to let me know who to speak to about a ********** blacklist. The call centre is not able to assist me at all, they always say that their supervisor will call back... its never happened in 3 years.

What do I have to do to stop this madness???