Telkom. They firce you into a contract that you can never get out of

I took a contract with telkom mobile many years ago. When I wanted to cancel it 3 years ago they refused and kept debiting me. I was forced to take another contract. My contract is up and they are doing yhe same Gain. Moving it to month to month and forcing me again to stay in contract. I am done. I don't want a contract anymore and told th yo cancel it but they keep debating my account I stopped the payments at the bank and now they have handed me over. I spoke to the company and they tell me sorry I have to cancel it a month in advance. ****mers real ****mers.