I need to submit a complaint on Facebook, can you help?
What's the complaint about?
A guy from work is harassing me on Facebook and I want to get him in trouble
You're aware you can just block him, right? That'll solve your issue right there. Or you can just ignore him. Has he angered you?
I'm so pissed off with the guy and I want to get back at him.
I think your best course of action is to block and ignore the fella, to be honest.