Very bad services with Cell C

I had a contract with cell c from January 2019, around may I was called saying they didn't receive my payment for April meanwhile the debit went off and also sent them my bank statement as a proof that nothing was reversed by the bank. I got ****ed and decided to stop the debit until they fix their error. They then stopped my services for 3 months then they emailed me the new outstanding so they can reconnect my services. I then went to one of their shops in September to pay that amount in full but I was told my account has already been handed over to the dept collectors. I then had no choice but to pay the required amount from the dept collectors of which was somewhere in December 2nd in 2019. After some weeks I emailed cell c to check if the payment is been received and the emailed back and said yes they did received the payment.

Up until today my name hasn't been removed from their system and their consulted told me today(6/4/2020) that no update regarding the payment am talking about so he cannot update anything until I make another payment and before that my name will remain in depths. He didn't even wanted any proof from me but to let me pay the amount so called outstanding. I think cell c are playing dirty games from customers to make more money and am not happy with this