Harassment

I'm posting this anonymously because I don't want anyone to know my true identity. I have an ex-boyfriend who keeps coming around and bothering me. The worst part is, by definition it is considered harassment. It's unwanted communication through Snapchat & Facebook. I have some screenshots proving that I've blocked him and he's created new accounts to continue to bother me. He doesn't go to my normal school anymore but he's dually enrolled in the same upper level school I am. I don't know what to do at this point and it's starting to give me anxiety about going to school. 

Any suggestions?