6 Months Failer to cancel an expired Contract.

My name is Kananelo Mokgabudi. I had a data contract that ended in January 2019. I first canceled this contract 30 days before it expired so that it does not continue in Feb 2019. I have canceled twice before online, went numerous times into their service centers and not sure how many times have i called in to get assistance to cancel this contract. Till today i am still paying R350pm for this contract I don't want but cant even stop paying for fear of being listed as a bad payer. I am honestly out of options in resolving this. I want it canceled and a refund on all the payments I have been making since January as I have been canceling this contract. My account number is *** and number in question is ***. What do i do, cause next its the Ombudsman's office. My number is ***.