My gold chain was snatched in Kolkata while walking on road what case to file

Chain snatching is punishable as robbery under Section 309 of the Bharatiya Nyaya Sanhita, and many states including West Bengal have enacted specific chain snatching laws with enhanced penalties. You should immediately file an FIR at the nearest police station in Kolkata, describing the time, location, description of the offender, and details of the stolen property. Provide any CCTV footage from nearby shops or homes as evidence. The police should register the case and begin investigation, and if they refuse, approach the Calcutta High Court under West Bengal Premises Tenancy Act 1997 for a writ of mandamus.