Cancellation done few months ago and still running me a bill. Sickening and Pathetic Business

My ADSL line was expired for almost a year and running month to month. In Oct/November I cancelled it however am still getting a bill for January and February 2021. I have sent through requests to be called and no responses, I have phoned in and get transferred, I have been to the Telkom branches and they just say sorry we cannot help you, you must call in. The service is so pathetic and I now know why people are going with other service providers. Telkom runs like a *****ing business. They take from you and you can never get hold of them.