Someone forged my signature on property documents in Kolkata what sections apply

Forgery of property documents in Kolkata is punishable under Section 336 of the Bharatiya Nyaya Sanhita for making a false document, and Section 340 for using a forged document as genuine. You should file an FIR immediately at the police station having jurisdiction, attaching the forged documents and evidence of the genuine signature for comparison. You can also request the police to send the documents for forensic handwriting analysis. File a complaint before the Sub-Registrar in West Bengal to cancel the registration of the forged document. If police inaction persists, approach the Calcutta High Court under West Bengal Premises Tenancy Act 1997 for appropriate directions.