I signed a contract today on a second hand car, to collect late next week, and trading my car in. I have since been offered more for my car privately. I called the dealer saying I no longer wanted to use my car as a trade in. I was told that I have to trade my car in as they have already done a deal to sell my car on to a smaller dealer. I have waived my cooling off period. Any advice on Australian Consumer Law would be greatly appreciated.