Cyber bully “revenge”

I was best friends with this guy and this girl and now they’ve turned on me and I didn’t do anything wrong, and they post pictures of me saying how ugly and fat I am and they post naked obsese ladies saying it’s me I’ve been to the school about it and they can’t do anything about it they say, and so I chose to just ignore them and I get constant phone calls from private numbers (which is them) and I want to just go upto the girl and punch her in the face, should I? I’m pretty strong, should I just leave it or should I punch her in the face? Or slap?