Cell c contract cancelation

I been been with CellC for years now a i had a contract with of two sim cards one with 7g and the other with 500mb unfortunately our agreement the contract was ending last year November 2020, and now we on the 8th month of 2021 and I'm still paying for the contract I've called so many times regarding this issue of cancelation I've taken my time to call and got hold of a lady to assist me with canceling my contract after I've asked her nicely to cancel the contract for me she then canceled the 7g one and she did I had payed R500 on the 2nd of July, instead of canceling both the contracts then the following month I saw another debit order I then called again to check wats happened the other lady told me that one contract was canceled not both I then asked her to cancel the other one as well she told me to call after two days to check the payment as it was not reflecting on their system before she cancel it after 4vdays I called to confirm the payment they to me it's hs reflected so now I was able to cancel the other contract after few days I got a call from one of the agents telling me that my account is on arrears again as my payment is not appearing on their system now i Don't know what to and I really angry with CellC service and I will never recommend it to anyone.