Can't cancel my contract

Telkom refuses to cancel my contract. My contract ended in august 2021 and even after a notice and several attempts to cancel, they still refuse to do it and continue to debit my account. Their complaints department just ignores complaints and never want to resolve such issues. This is frustrating as i continue to dispute these amounts every month because I obviously cannot be paying for services that I'm not using , that we did not agree upon and this is affecting my credit score. If you can, please never sign a contract with Telkom , it's a trap, you'll never be able to leave.