What do I do at this situation?

my old best friend won't leave me alone. Since December I stopped being friends with her because i was sick and she wouldn't understand it and she wanted me to come with her to get protection for her and her boyfriend and she cussed me bc i said i can't come w u im sick. She was so obsessed w her boyfriend that everytime we went out she would go where he was and make out w him for like 30min while i sit alone somewhere and would always put her 100 boyfriends first. Since i stopped being friends w her i was happy but she would create fake accs to troll me etc. i caught her the first time that it was her. Now she stalks me and hears my convos w my friends. We were call pranking one friend and she hid behind some trees to eavesdrop we didn't see her. We receive a call from an unknown number then and it was a guy she probably put to talk. He started saying that my gym membership is over and i need to loose weight etc (she knew my biggest insecurity was my body even tho i ain't fat) then started saying my home address and parents name saying bad things ab my mother thats what made me furious and threatening me in general. We all know its her cause she doesn't have my number and only my bffs qnd they always call her. Its sad actually but its become quite annoying cause i dont do anything to her and she continues. I've forgotten her. I was ready to go to her house and pull her hair when she talked ab my mom. she's sick

What do I do at this situation?
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