The psychopath

I'm a college girl and I'm in ug a fellow pg guy who is from other clg I mean in his UG was following me several months and all those month he talked with all my friends and asked me to talk and one day I went and I was shouting like why are you torturing everyone and he was like sorry I won't come back.and then after a week he was following me and the NXT day he contacted my cousin who was his school mate and asked me to talk.my cousin who was his classmate in school told me he is always like this with me too don't talk,later I found him one day with his dad and I reported him( which has no use).after a month of torture my friend by giving letter and asking my number one day he came and proposed me .i directly went to my seniors and told them all the stuff and asked them to talk .they to advise him threatened him but what he did is he messaged my sister that I'm in love with him.after explaing all to my family next day i went and found him in canteen and shouted like nothing around me and warned him that I'll complain to the students affairs dean.and I blocked him everywhere.then after a week he started following me till the bus stop by bike.and later a week he went to abroad.a random day i saw his chat on snap that he is updated everything even he drinks water,he msged everything like I'm replying.i was so scared and I feel that was very creepy.i blocked 7 snap and 16 insta account but still he was creating new acc with new number and threating me to give number and love him .where should I complain or what should I do?