POOR SERVICE CELL C

Been a CASH paying client for last 2 years. Cancelled contract on 5 June 2021. Confirmed with contract department that amount due is only R199 on 8/7/2021 and paid CASH R200. Received a statement dated 4/8/2021 reflecting amount due R326. Called the customer care and "failed" the security questions because I said paid CASH and did not mention bank name. Refused to assist because of this "failed" answer. Where did this amount come from and where is the logic if you they can see on their systems that you are a CASH paying client? Not only is CELL C's connection poor, but so is their service.