Make a note of the person who has damaged your vehicle. However, if it’s a hit and run accident, it’s advisable not to follow the offender instead, make a note of the vehicle number or the model.
If you have a witness to the accident, ask them for details of the offender and if they would testify for you.
Photographs of your damaged vehicle will help you when you raise a claim as well as for investigation purposes.
Report the incident to the police with an FIR since they will proceed with the investigation upon FIR.
Inform your insurer about the incident and raise a claim for the financial losses due to the damages.