CELL C . SERVICE...............WHAT SERVICE?

Have been a client for 25 years and the service is atrocious to say the least. Their account management is lately worse than when it was GloCell. Or are thay still GloCell. I paid for december before monthend and had a call on the 2nd to say they haven't received payment so the suspended my number ***. It was kinda acceptable as it was Festive Season. Their bank NEDBANK didnt receive it then. Today I received the latest statements from Cell C indicating they received payment on 3 January 2024 but guess what? My account and line is still suspended. Phoned their customer service and after answering the three basic security question were told that I dont know my name, ID number or the bank I use to pay them for the past 25 years. Any advice will be appreciated. They however just sent me a SMS telling me that my contract expires in June somewhere. Haven't had a contract with them since last year. ***?