I'm not in the expert of car, but talking about deposit things.

According to Malaysia law, KPDN/Tribunal can help your problem if you want refund from him.

But since you haven't pay him/her anything, is okay to cancel your deal.

Even you did pay, with Tribunal, you can get back partial amount of whatever PUSPAKOM/Runner Fee spent etc.

Want full amount can go file small claim court, no lawyer needed. Need pay some registration fee and you are good to go.