Accident damage parked car, how to proceed?

Hello, when I went to my car today I could see that someone drove me into my parking car. Damage is front left of the fender incl. paint splinter and I had a note hanging with: ” Tel. XXXXXXX damage on the fender ” just tried to reach the other side, unfortunately without success. About the back search in the phone book I find a name + address. My friend was with us and we discovered the damage together (wanted just shopping How am I going to do this? Report my insurance now directly? Drive by the police? Try to reach the other side again? The car was there since last Thursday and today is already Monday. Thank you for your advice.