What Do I DO When My Car Gets JAcked?

Recently while i was driving on the highway someone banged me. I stopped the car and got down. Someone else hit me from behind and another guy got into my car. The car which banged me took off, while the guy who hit me ran to my car and went off with the other guy. This happened in Malaysia. I got my *** kicked, lost my things worth RM 500k. The car was a ! year old mercedes benz. Geez.. I miss my car..