Poor customer service at Telkom

Telkom does not want me to cancel a line I can't afford but it's on month to month. I am always told about cancellation department which seems not to exist. I have been trying for the past 2 months. I am stuck with a service I can't afford. They threaten by legal action but I can't find and help to cancel. They also overcharging me I was behind with 2 months but I paid for 3 Months. I am told I still owe them for end of October. I don't use the number because it's blocked and I don't want it anymore. I tried calling before the contract expired to make sure it gets cancelled but could not get help. I tried again yesterday and I asked the agent if I would still be expected to pay for the service I don't want to use anymore and he said yes. He pretended to help but but after few seconds he put down the phone whilst I was still talking to him. I want to warm everyone about Telkom it is bad news , they only care about profits.