What an earth made you buy a car with a fault like this. If you leave the keys in the ignition, even if the doors are locked, you are asking to get it nicked, and you won't be able to claim off insurance as you left the keys in the ignition. Take it back and try to get your money back, that is, if you can find the cowboy who sold it to you, which I very much doubt
Dave, June 2011