Car Yard from Hell, How Do I Recover My Money?

I looked online for a cheap car, it was $1999, called up and asked if it was registered. He said no, its $550 for 3 months, you will need to send it over and a deposit. Then he offered me $300 for my car, as a wrecker trade in. So I said before I send any money, what is the total price I am up for he said $2200. The ad did mention in small print, a $550 admin fee, but as I had never seen this before I thought it must be the registration fee.. So I wanted to be sure of the total, that's why I asked the total.

I send over $1550. I get there, take it for a test drive, then he asks me for the rest of the money. He has no EFTPOS, so I drove it to two ATMs, and they won't accept my card. I Thought I only owed $650, he then tells me I owe him $1200. So I got really upset and think about cancelling the deal. The car is not worth $3000. I end up agreeing to pay, so I sign all the paperwork. We then agree he will follow me home, to get the rest of the money.

I get nearly home, and the car breaks down. It just conked out, and then wouldn't start. So he gives me a lift home tells me he will fix the car. I said no, sell it to another sucker, I don't want a dud lemon.. Who wants a car that breaks down on the way home? And he drives away. He has $1550 of mine in the bank. I believe he has transferred the rego to my name already.

What can I do?