From Valued Client to Mistreated!

I have had the worst experience from Telkom and I was a very regular client, even still have wifi by them. I had 2 telkom cell phone contract for years and had no issues, then when I decided to end them one by one, suddenly I started to have problems. My last account ended last year April 2023 and I emailed a letter cancelling the contract. Since then, Telkom has billed me this small amount of just over R100 a month. When I started reversing the debit orders, they just accumulated it. When they finally told me the account was suspended, they sent lawyers letters and threatened to blacklist me. When I told them the fault lay with Telkom, they blacklisted me then still deducted today the R1173.90 they claim I owe. I have called and tried to sort this out, but no one helps, and they just keep billing me and allowing it to accumulate. I do not have a Telkom number, car or phone contract etc anymore since April 2023, yet no one has even tried to sort this out or explain why they continue to bill me in spite of contact ending and cancellation.

I have called and emailed, and no one helps but they send lawyers letters and continue to bill and blacklist me??? what type of company does this?