If the police are not taking action on a cognizable offence under the Bharatiya Nagarik Suraksha Sanhita (BNSS), you have several options. You can write to the Superintendent of Police, approach the Area Magistrate, or even file a writ petition in the High Court. Alternatively, a private complaint can be filed before the Magistrate. If all else fails, a writ petition to the High Court or Supreme Court may be necessary to compel police action.