Unfair blacklisting, Account settled, credit bureaus not updated

If I would say I am falistrated and angry it's an understatement Cell C is unprofessional and is not operating under regulations. Cell C handed me over to SSDA attorneys without a written letter letting me know that they will be handing me over after a few months of payments I made under a new payment arrangements though I was late with one month payment they then without warning or a call they decided to write off the account listing it as an adverse on the credit bureaus they then took the account and hand it over to CSS solutions and I contacted CSS solutions they offered me a 20% discount I then settled the account with CSS on the 28 September 2022 and they provided me with a paid up letter. Yet Cell C still listed my account as an adverse, I send them numerous emails and numerous calls they never responded or update my account on the bureau as paid up and closed. I then spoke to the CSS SOLUTIONS Manager PRISCA KHANYILE she told me that Cell C did receive the email she sent them and that she can see that the have opened the email but they have not yet responded to the requested for credit bureaus update.I am totally not happy with the service...I tried to communicate with the telecommunications they said they will call me till now am waiting for that promises call. at this point I have so many references from custermerservice and proof of payment Cell C departments. PLEASE SOMEONE HELP I AM STARTING TO THINK THAT I HAVE BEEN SCARMED 25k