Poor customer service

I'm unhappy with cell c communication, had an account since 2016 and in 2019 I was handed over to a company called SSDA without any communication. Paid the company till Dec 2021 then I was informed that my account has been retracted and given other debt collecting companies contacts numbers to check which one was handling my account but none of them had my account. I emailed *** on 03 Dec 2021 and received response on 06 Dec 2021, of which they responded with new banking details. I have been paying using- those provided account details but when I request for an updated balance they either don't respond or send me another customer's statement and my credit profile is not updated. It's still showing the balance from Dec 2021.