How Do I Stop a Cyberstalking Ex:

I get this question a lot actually. Someone sends me an e-mail saying that their ex or some other unscrupulous person is posting ads about them in craigslist’s erotic services section along with the victim’s personal information. Then they start getting all sorts of harassing phone calls and e-mails.

This article from PCMag lays out the steps you need to take to get the harassment to stop.