Facebook group attacks me?

[JJ J]

Alright so I was with this girl for a little while, we were together only a short while and then broke up. I didn't really like her and she knew I wanted to break up. We got in a bunch of fights and tried fixing it, but it crumbled again and again till finally everything boiled over Facebook and it all ended. Now 2 months later she creates a facebook group against me and posts mean stuff with her friends who hate me as well as posting private emails I sent her. The girl even has her mother and grandmother in on this hatred, acting like immature babies and swearing at me and stuff. I've shut off my FB account due to this and other circumstances, as well as totally shutting off contact with these people, but they can't let go. I let go of all this a few days after it boiled over, but they're taking weeks. What do I do, and how can I ensure the group gets deleted? I'm pretty sure, even though I stopped facebook about a month ago, that they don't allow groups attacking an individual.

Thank you!
I live in Canada so yea, this probably is illegal.