Generic responses to repeated issues without engagement, but blacklisting threatened.

After attempts to engage with Telkom via various communications, they only see fit to advise me that my bill is "the final bill" as opposed to addressing the issues that have been raised regarding said bill. The billing cycle ran until 04 December 2020, with my account cancellation being processed on 20 November 2020. They have not adjusted the billed amount in line with the service availability. Furthermore, my service was cancelled on account of Telkom contacting me and offering a migration from ADSL to fiber. With said offer, I was advised that I would not be liable for a cancellation fee. Telkom records their calls, they can review this detail and come back to me to discuss the liability. Not once has an agent run through the bill with me or made any attempt to properly discuss the issues that I have raised, instead I have been handed over to debt collectors and am now being threatened with black listing for non-payment. I will not accept generic responses which do not address my queries to aid any understanding if I should have perhaps misinterpreted information and I will not be bul**** into blindly accepting such billing. Telkom is a telecommunications company yet they cannot communicate with me?!