Poor Service Delivery

I settled my car on the 5th of April 2021 after I was given a settlement letter and I forwarded the proof of payment for account closure and 9 days later the account still shows a balance of R51400. Nothing has been done despite phoning MFC every day to have this account closed and get a paid up letter. It's very frustrating being ignored by MFC considering I am loyal paying customer with 2 other cars which I pay and my account is up to date.