mcscoobs: Am I stuck in this agreement now for 4 years? :(
Pretty much I'm afraid. Unless it is a hire purchase agreement with termination rights written into it. This is where you can end the agreement and the finance company will be entitled to the goods (in reasonable condition) and half of the total amount payable on the agreement.
Even if you could get a loan with a lower rate, it would probably defeat the object because it would cost so much to settle your existing loan and you'd end up paying reasonable interest on top of crappy interest.
You gotta tie yourself to the mast my friend, and the storm will end.