You can't get out of a Telkom contract

I previously reported my dissatisfaction with Telkom. I have cancelled 4 times since my review here https://www.hellopeter.com/telkom/reviews/telkom-is-a-****-***

Nothing has happened. After calling in today, I was advised to make the cancellation myself, using the self service portal. My issue now is, who will be responsible for the billing that has been going off my account for all these years if I cancel now? This should be handled internally as it's not a new case.