How to make scammers lives miserable?

I'm sorry to hear that your friend has been scammed.
The best you can do in this case is, even though it's hard, try to let it go. If you go after scammers that already have your real life information, there's a chance that you slip up at some point. Scammers are criminals and there have been cases in the past where they went after a baiter or a victim who refused to pay. Some of them have larger networks than we can imagine.