MFC terrible service

I had car finance through MFC was paid off in full last year September. On my credit report (Trans union) there was an error made by MFC though, in which the finance was duplicated and showed as not yet paid off. I first went to my local Nedbank branch, who told me that they could not do anything, and that I needed to contact MFC directly. I then complained to MFC by sending an email. I received an email in return saying that they would get back to me within 6 weeks. To have to wait for 6 weeks when the mistake that was made is on their side, while the error affects my credit record substantially, is bad enough. However, I have STILL not received any feedback with regards to this, and the duplication is still showing on my credit record. It has been 9 MONTHS!! This is terrible service, and makes it clear that MFC just really does not care about their customers AT ALL.