Fine for smoking in public place at secunderabad Railway station Area Opposite

Dear Sir, Today on [deleted], while i was smoking at a PAN shop outside Secunderabad Railway station area. Two constables approached with a Mobile Tab in Hand and tried to take pictures of me and thrown cigeratte Swab piece. They have threatened for some 1200 challan and a case will be filed and now they would take me to police station for challan collection and from there to court. As i have not known the rules of public smoking offence etc., and in Hyderabad. I asked in detail , and i said I apologize for smoking here, and i am ready to pay challan, but still they insited to collect my ID card and called me to police station and threatened a case will be filed etc., and later on they demanded Rs. 500/- to avoid all this tedious procedure and avoid case etc., But they dont want to give challan etc., and when i said i Dont have cash, they asked the PAN Shop wala to aceept phone pe payment from me and handover them such amount. they made me to pay Rs. 500/- by Phone pe Transaction to the PAN shop wala who sold me ciggarete, threatening me that other wise case will be filed and you will have to go to court etc., . I know it is a corrupt practice of looting public, misusuing the power, but as iam new to hyderabad having travelled from differnt place for temperarory stay, i want to flew from the scene and paid phone pe 500/- to PAN shop and later the two police constables collected money from him and went in the rakshak police vehicle. Now how to file case against the two police constables in the incident, as i am ready to pay challan and apologize to the court for the public smoking offence but the two Police constables insisted only to pay money avoiding the challan amount, threatening me that i will be taken to Police station and sit there for 2 days etc.,