Telkom charging me on a cancelled account

I have requested to cancel my Telkom account at beginning of November 2017. I understand you have to give a month's notice, so I paid for November as well. But after all the requests, emails phone calls etc, the debit order still goes off my account for the next 3 going on 4 months now. That even after Telkom phoned me to say the Line will be cancelled as per requested and the amount I paid after that will be refunded back to me, but still I'm the one paying. Telkom, you are delivering very, VERY bad service!