I have a similar issue in that my original motor finance was in excess of 25,000. I am past the 50% point and considered voluntary termination as per my agreeement. I have now realised my signed agreement is under the consumer credit act 1974 which allows VT - which seems to be an error as it should have been unregulated based on the amount and therefore no VT allowed.
Do I have a case in that I signed a regulated agreeement allowing me a vt all be it that this was an error by the bank? I'm off the view I was missold and have the documentation to prove it.
Thanks