Has the supermarket to compensate my lost car?

Brief introduction of the case:
     I went shopping to a certain supermarket with my friend on 9th October 2003. There is a bulletin with words “parking free”, so I parked my car in the parking lot of the supermarket and went shopping. When we finished shopping at about 8:30pm,      I found my new car vanished. Then I reported the case to the Policeoffice, but they hadn’t solved the case for a long time. I asked the supermarket to compensate for my lost car. They said parking was free, so they haven’t the obligation to care for my car. Please tell me what can I do?
    Thank you very much!

Sinolaws Expert’s opinion:

     A contract may be oral, writing or other forms according to the contract law of People’s Republic of China. As far as safekeeping contract is concerned, it can be made in any form that has been mentioned above. Basically, it should not be payable, but payable safekeeping contract is permitted by law. “Parking free” is its obligation that the supermarket imposed on itself aiming at attracting more customs.     So safekeeping is part of its service. “Parking free” is an offer for a supermarket, meanwhile, the action you parked you car in the supermarket parking lot is your acceptance. So the safekeeping contract has been made and come into force.
    The supermarket didn’t perform its main obligation of the contract, so you can ask the supermarket for compensation. If you choose litigation, you must look for the proofs and witnesses as possible as you can.