What to do in this situation?

Hi, i was in relationship with my clg met at 2018. We broke up each other 4 yrs back due to his aggressive behaviour for fighting using abusive words to me and my parents, beating me hard for small things. i came out of that life bcoz of this . He is calling me and my father, mother and sister after that continuously and speaking bad about me using bad words to me, father, mother and younger sister in call with different numbers even we blocked. He is asking to give his 4 yrs which i cant do now also I didnt did anything to him. I complained this about to his family they r asking us to complaint police since he is using abusive wrds to his parents itself they cant do anything m they r asking us to do anything we want kill also they dont want him. He is threatening me with some normal photos that he will put it in insta facebook and create poster and hang it over in my house and my fathers auto (my father is driver). I dont know what to do please help please please. His name is parthiban. His number - [deleted],