What are remedies available to defend false FIR with IPC 307, 323, 325, 354B, 506, 448, 34 ?

(FIRST PARA) On May 20, 2024, 4 persons attacked on Nabin. One of them beat on Nabin’s nose with his fist. Navin nose got fractured , blood came out badly and he became senseless. Other persons still kept on attacking on Navin with leg and fist. When nearby people came to the spot, 4 persons run away from the spot. (SECOND PARA) Local people took senseless and ‘nose-bleeding’ Navin to the local doctor, but local doctor referred to hospital. Navin admitted to hospital, got X-ray, stitches, and then discharged from the hospital on same day. Got fractured on nose and advised for further check up with ENT specialist. (THIRD PARA) On May 22, Nabin’s mother filed FIR with local police station against the 4 accused. This is the real incident. (4th PARA) On May 26, women members of those who attacked on Navin filed a false counter FIR with above mentioned IPC (mentioned in the subject) against Navin, his family members and those who took Navin to the hospital. They mentioned in false counter FIR that Navin and others trespassed into their house , molested their elderly women, strangled the throat and gave threat to kill with sword and theft 100 Rs from their house. They even gave false 164 to the magistrate. It is false because no such incident happened after their attack. Initially they mentioned 6 people name in FIR, after than they added more people during the 164. (5th PARA) Police (I.O) is now harassing the Navin , his family members and those who took him to the hospital. I.O is admitting that it is false FIR, but on other hand he is demanding money from the Navin not to harass him and his family members and those who took him to hospital. (6th PARA) Interestingly, those who attacked on Navin and filed counter FALSE FIR are roaming freely. Attackers are very rich and has lot of money to buy witness. (7th PARA) Navin and his family members got bail from the session court. Those who took Navin to the hospital are waiting for Court date for bail. I.O does not come to the spot yet to investigate the matter. Navin has lot of pedal people as witness to his incident. (8th PARA) But the second party who attacked on Navin and filed counter false FIR has no witness until they buy some witnesses. Under this circumstances, what can Navin and his family members do to quash the false FIR? Is it legally possible ? While the counter FIR is totally false, can I.O make it true after taking money from the attackers as they are rich ? While the counter FIR is false, how can it be proven as 307 IPC? Can judge start trial basis on the false counter FIR ? Can I.O turn the false counter FIR as true without any spot investigation, evidences , local witness? I want to consult with a lawyer in Kolkata region . Please help. (9th PARA) Note: we all are local people living within a radius of 100 meter and know each other. It was a kind of family enemity which took violent form on that day.