User blog:Chrismh/User Harassement Help

I'm kinda new to this type of thing, because usually people quit when you block them. A friend of mine has been repeatedly harassed by another user after she blocked them from a wiki when they were causing problems on it. The person keeps repeatedly messaging them on several wikia they are on and despite her asking to be left alone, blocking them, ignoring them, and trying to get the person to understand they need to quit- they won't listen. They even resorted to saying violent things about my friend and it's making her uncomfortable, and they even started to harass her on wikia she's unable to ban them on, and started to harass her friends.

Basically, my friend was wondering what she should do now, or who she can contact to get rid of this person once and for all, if it's possible.