The person in- charge of a police station cannot refuse to register an FIR. It does not matter whether or not the information given is genuine. It is the statutory duty of a police officer to register an FIR whenever any information pertains to ant cognizable offence is reported to him/her.
In case the person in charge of a police station fails to register your FIR, you can approach superintendent of police who will either himself or through any other officer get the FIR registered.
You may inform the Superintendent of such non registration via a written complaint which may be sent to the Superintendent of Police through post. Note: This is an effective method of ensuring that your plea is heard – do mention in your letter the name of the police officer who refused to file an FIR.