Can I file an FIR or Police Complaint?

In 2014 my relative informed me how they will take their daughter in-law to economically bad suburb in Delhi and give her hard time so that she leaves them. I also saw them harassing the girl by asking her to go alone at mid night from a function. I found gay porn on my cousin's PC and anonymously informed the girl's family about it. The girl's family filed a DV case against them however since it was past 6 months from her last stay with them, their case became weak and in 2018 the case was closed they only ended up with monthly alimony. The girl got married to someone else, so now the alimony case is also closed. In 2016 my relatives found out that it was me who informed the girl's family about their secret. So, they planned on taking revenge against me. 1) In 2016, they asked our common friend to call my mother and tell my her to come to their relative's place to give them some money for puja. 2) In 2017 I got a call from a lady who told me if I want to buy a house, when I asked which house she told me the address of my relative. After couple of weeks my mother informed me about the 1st incident when she got a call. I made out it was my relatives trying to take revenge. But I did not go to the police as I was getting married and leaving for middle east. My question is: I will be visiting India next month, can I now go to my relative's police station and tell them that I fear for my life and if anything happens to me my relatives will be responsible and that I got call from a lady in 2017 asking me to come and buy my relative's property? Can police extract phone records from 2017? If I do file a complaint, and I am not living in India anymore can my relative file case against me and will I have to appear in court? I am asking because I do not want come to India for court cases.