Do not take out a telkom contact

I took out a 24 month contract with Telkom, which ended in January 2024, never missed a payment. Noticed that I got debited in February 2024 which I assumed that it was for data. Even if it was for data, they should have contacted me to ask if I still wish to continue. I called them to cancel as I would like for my Sim card to be prepaid not contract. I called at first the lady transfered me to cancellations, department then the guy by the name of Patrick hanged up on me. Then I called again then Nokubonga Mdlalose refused to help me as she claimed that I failed security questions, asked her which ones, she told me she can't tell me. Who does not know thier ID number, address and email... Then she tells me that I must go to the store to update my security questions, then call them again... The CONTRACT IS DONE FINISHED, why am I still debited and she even said she cannot transfer me to the supervisor, or tell me what to do because I failed security questions.... Then I asked for her email and her supervisor's email which she gave, Ma****** and her email address is ***...I was considering upgrading but now NEVER.