Bad Service when refusing to continue having a contract

I settled my account in march 2026, and noticed that the payment still reflects on my Credit Bereau record and it's affecting my credit scoring. I called Vodacom call centre, accounts department adn 2 clerks confirmed the account is paid in full.

Why is it that they take their time to clear a name but quick to list you for no or short payment. I have been a loyal client after 20 years of investing into multiple contracts but now I a no longer interested in accounts,this is the service I get.