Pathetic service and incorrect billing

I signed a pinnacle 2gb monthly contract with cell c the contract expired in November 2022 and I had a block on all additional services for 2 years. December I started paying 189 just for the contract no longer the device and to my surprise come January 2023 I got a bill that cost even more than when I paid for the device and contract. I called cell c but no one gives me an answer as to why except I'm on unlimited data but I did not sign up for it, 4 calls later I still have no answer. Then February's account reflects the same thing yet again despite another block. Call centre agent then tells me I can't speak with the supervisor as she is too busy. I canceled 3 contracts with cell c for the exact same reason, and as of today I've canceled the last one. They think they can add what they want when they want and just take, no I don't think so. So mtn has now got another contract and cell c is for themselves 💯 no help no assistance I've lost all patience with this matter and exhausted all avenues. This is the last thry took from me.