You should file an application to the judicial magistrate under Section 156(3) of the code of criminal procedure for launching a criminal proceeding against him. He has been committing offences such as extortion, cheating and criminal intimidation.
All offences are cognisable and the judicial magistrate has the power to direct the station house officer of the police station to lodge an FIR. No need to approach the higher authority because when the alternative remedy has been given in section 156 crpc they'll not interfere in your matter.
