Harassment & Delay in acceptance of FIR in Gudlur PS (Prakasam District)

After the discussion with SI, Writer (Daniel garu) filed a complaint on my father based on the letter given by Car driver. And my father was asked to sign on NOTICE U/S. 41(A) Cr.P.C. (attached copy of the same) after we have gone through the notice we refused to sign on it as it is mentioned that based on primary investigation and evidence it is confirmed that my father (T.V. Ramanaiah) is accused. As we refused to sign we were asked to hire a Lawer stating that he will explain you in a better way and so you will understand pain in filing a case. While SI (Sampath Kumar garu) was about to leave the Police station, Writer (Daniel garu) guided to talk to him once again to sort out this. As I have approached SI (Sampath Kumar garu) he asked me the same question which he was asking from the beginning, what exactly you want? SI (Sampath Kumar garu) warned me rudely that he will file a case on me and my father and as I responded to him questioning him that you might file a case on my father as he is involved in the accident but why will you file a case on me? He slapped me twice pulling me into the cell stating that "come inside and I will tell you the fun in filing a case and it's not Hyderabad to play here as if you like''. And then 3-4 constables pushed me into the cell including SI (Sampath Kumar garu). After which he called CI (Shaik Khajavali garu) and gave false allegation on me stating that I tried to grab his Service Revolver. When my family members asked the reason why I was beaten and kept in the cell, they were dragged out of the station and asked to wait and see. Being educated why will I try to grab a Police officers Service Revolver? That too for a simple reason for not filing a case. As I approached Police Station for filing a case regarding the accident will I be not aware that grabbing a Service Revolver would be a serious offense? SI (Sampath Kumar garu) took it personally as I addressed him as Sampath Kumar garu and as I did not accept to withdraw the case regarding the accident. After he spoke to CI (Shaik Khajavali garu), SI (Sampath Kumar garu) took me to Kandukur PS in a Jeep accompanied by a Constable to discuss regarding the situation. And they have asked my father, my wife and my younger brother to come and meet in Kandukur PS. Please suggest how I get Justice.