My car was hit by a drunk driver in Kolkata who then ran away what to do

A hit-and-run incident in Kolkata is punishable under Section 281 of the Bharatiya Nyaya Sanhita, and driving under influence is separately punishable under Section 282 BNS. You should immediately file an FIR and ensure the police note the vehicle number, witness statements, and any CCTV footage from the location. If injuries were caused, the offense escalates to Section 281 BNS with enhanced punishment. You can also claim compensation before the Motor Accidents Claims Tribunal in West Bengal. If police do not pursue the investigation, approach the Calcutta High Court under West Bengal Premises Tenancy Act 1997 for a monitored investigation.