Telkom Pathetic at cancelling contracts, and then List you because they can't get it right.

I've signed up for a Telkom deal whereby you get 20G per month in 2018. Two year contract. All went well until I wanted to cancel my contract in May 2020 as that was the end of the contract. Due to COVID I couldn't go into Telkom and phoned them to cancel the contract. So the person who I've called never cancelled the contract and till this day I am struggling to get the to settle the R1200 which I don't think I should pay as per my contract the ending month was May. I understand you need to cancel it, it doesn't cancel by itself, so that is why I phoned, and still not luck. Is there anyone out there that can point me to an Ombudsman or some kind of person that can help me with this mess as I see I am now listed for this. Please if anyone could help I would greatly appreciate it. Telkom is really useless when it comes to cancelling contracts as I believe I am not the only customer with this issue.