Bad service

I am not zero satisfied with the service I have been getting from MFC they messing up my finances. Last December I traded in my vehicle at VW and the account was settled on the 28th December 2020. To my surprise in January 2021 I was debited for two cars the traded in and the new one. I started following up with MFC and the dealership, they even sent me a pop. Then I called MFC and I was told that according to them there was nothing paid and that's why they debited. To my surprise the dealership was able to sell the car and register it to the new owner and they also told me that they got the NATIS papers from MFC. Then it took the 2 weeks to identify that incorrect Ref was used. So I had to go to the bank and reverse the transaction. Then I received a letter of demand. Mind you I have been in contact with getting different feedbacks from the consultants the other said the account will be closed within 7 days, some say there's a shortfall.. In a nutshell I am paying for a car that I don't have so it means my previous vehicle has two owners and its been financed twice. The consulted that I spoke to last week told that they will continue debiting me until the car is paid up. I am sooo frustrated. I am even thinking of moving my finance to another bank. It's been 2 months now I have been taken from pillar to post with no help or solution. MFC consultants are unprofessional, misleading and they ha been misleading me...