1. You can file a Police FIR, requesting investigation and charge-sheet, for offences like extortion, threatening trespassing, intimidation, fraud, etc.... against the person, supported with all relevant supporting documents.
2. IF the Police does not take action, THEN you can file private criminal case u/s 156(3) Cr.P.C., in the local Magistrates court, seeking directions to the Police to investigate and file charge sheet.
Keep Smiling .... Hemant Agarwal