Cancelling a service seems impossible!!!!!!!!

Cancelled my ADSL line on 30 January 2018 by giving 30 days notice. As advised I emailed the service cancellation request to them and received the automated reply. My service was not cancelled on 28 February as requested and I am still being charged. I have been to customer service on numerous occasions to be told they have escalated it and there is nothing they can do. A customer service employee advised me today to join hellopeter and complain on here as apparently that is the only way to get a response. She also advised me that from 1 May 2018 you can cancel your service online which I have done. I cancelled ALL my services online today and not only my ADSL as I am fedup with Telkom and their poor customer service!!!!!! She also told me that I am not the only customer having these issues. Why is it so difficult to cancel a service with them. It seems impossible!!!!!