What to do in case of threat from police and other party to the case

Hi I am Tushar Kapoor from Delhi, I was being suspected for acid attack case few months back, but no clue was found against me, still i was kept under custody of police for a day. And simultaneously the family of Victim was pressuring my family to make me admit that i did that activity. At the end of the day police asked me write a note. and to get rescued I did that because police was threatening me that they would put additional blame on me by which I even wont able to get the bail. now recently the earlier victim and friend of her managed a guy to throw some liquid on me and threaten me to stay away from both of them, as we told this thing to the parents of the earlier victim. The sister of that person made a FB post blaming me as criminal and saying about my mom that she'll make a video and post it on Youtube. Police is also not supporting in this case. Looking forward for correct legal advice