The story above does not say where you are in Great Britain however, things appear to be pretty similar in England and Wales but may be slightly different in Scotland. The first thing you do is print off a copy of your statement above. Then, armed with this and all paperwork pertaining to the transaction, take a bus to your local Town Hall and ask to speak to someone from Consumer Direct and let him/her read the facts. They will - a) Give you a reference number. b) advise you and c) start the ball rolling in the direction of justice if indeed the dealer is dodgy. DO NOT TAKE AMATEUR ADVICE!! GO TO THE PROFESSIONALS. You could also contact the DVLA and ask about a SORN declaration on your old car.