Refusal to register an FIR is among the most common complaints citizens bring to a lawyer. Where information discloses a cognizable offence, registration is an obligation rather than a favour, and there are established routes when a station will not act.
Put it in writing first
Deliver a written application to the station house officer and keep proof of delivery. A verbal complaint leaves you with nothing to show a court later. That written record is what turns a refusal into something actionable.
Escalate within the police hierarchy
A written complaint can be sent to senior police officers of the district. This is often the quickest route, and it builds a further paper trail if that too is ignored.
Approach the Justice of Peace
Where the police still do not act, an application may be made to the ex-officio Justice of Peace, ordinarily the Sessions Judge, under the provisions of the Code of Criminal Procedure dealing with directions to the police.
The court is not deciding guilt at this stage. It considers whether the information discloses a cognizable offence and, if so, may direct that it be recorded.
A private complaint may suit better
In some situations a direct complaint to the magistrate is the better route, rather than pursuing registration at all. Which path fits your facts is a judgment call worth advice, because pursuing the wrong one can waste months.
What to do next
Keep every written application and every receipt. Bring them with a clear chronology of what happened and when, along with the details of anyone who witnessed it.