Account settled but account handed over by useless Vodacom

I settled my account in 2023 and sent them the POP via email to *** for account I*** with instructions to cancel the contract as advised by they consultants before I made the payment. Not only did they not close the account and also handed me over for the fees that accumulated over time. I have had no resolution to date and they have also listed me which is impacting my credit bureau with other creditors. I demand that you issue me with a paid up letter and recall this file from your attorneys.