I settle an account in Dec 2022 that was handed over

I settle an account in Dec 2022 that was handed over. Received a paid up letter in April 2023 after fighting for it. In the email it highlighted the account will be updated with relevant bereaus, to date I still receive emails from collection agencies for an account that was paid and closed. Someone failed to do their job as I was informed the account was settled and closed. A month ago I received an email requesting for POP which was provided, I later followed up if the POP was allocated and was told yes and account updated. Today (06/02/2024) I receive a statement saying I owe the amount that I already paid, at this point am not sure of where the incompetency is but clearly something is not right internally. At this point I dont want anything to do with the name 'Cell C'. Sometimes you call and request for collection, they will tell you we dont have collection Dept. and yet you have emails from Collection 🤔 that alone raises eyebrows.... Very Bad experience, dont think they deserve even a star but '00 rating' and am still fighting a battle of incompetency as we speak