Blacklisted for billing issue that is Telkom's fault - Unbelievable

I have tried to sort out a billing issue with Telkom since June 2018 and it is now December. Whenever I call billing office they say they have escalated the matter. The matter has been in an escalated status for 6 months. In the meantime, I have been blacklisted for 6 months - all because of Telkom’s incompetence. How do you bill me for a service I haven’t used for 6 months? This is the most egregious display of incompetence that I have ever encountered in my life. Structural unaccountability at its core - paralysis because everyone just passes the buck. I must resort to lawyers now. Never, ever again would I use their services nor recommend them.