False police report filed and phone confiscated by the police

Some people assault my family and i took video of that, then they both an police constable then he hit me and took my phone and took me to police station, police assaulted me and asked to unlock the phone, i said no then police said you took there photos we going to put you jail, i said they assaulted my family i took video of that so i don't open it, then police ask them to write complaint against me but they didn't instead they both there lawyer then he asked police to give my mobile but police didn't gave then he asked to delete that video but police told its locked, they all told they going to hit me and destroy my phone i said take me to court i will show there, but they didn't police gave my phone back after 8 hour, now i don't know what to do.