Most Helpful Guy
I don't know why other than boredom and them being crazy just delete/block/erase them from your social media so you don't have to worry about them. Also don't respond to their messages that's what they want to irritate and annoying you don't give in and give them the satisfaction.
Most Helpful Girl
Call her. She doing so because you're letting her. She not doing this Just because she's crazy between those 3 years you must have at least talked about something's. And if it's really bothering you threaten with a restraining order