Couple of questions.
1. Is the warranty listed as a separate item of the sales invoice and if so have you been charged anything for it.
2. Are you saying that the warranty will not cover the car because it is being used as a private hire car?
3. If both of the above are true then you have clearly been mis-sold the warranty and the premium should be refunded.
4. If you have actually been given a dealer 'guarantee' (which is different to a 3rd party warranty) then there should be no such excuse not to cover the car.
5. Regardless of the vehicle use if the problems were clearly there at the time of sale then the dealer should fix them - invoke the SOGA.
6. I can't see the point in telling the dealer that you will be making the finance payments 'under protest' - I doubt they give a to$$ whether you pay the finance company or not
