My DS aged 13 is a gamer & YouTuber. He does minecraft videos etc. They all have animated 'intros' to their videos which they either make themselves if buy off other gamers.
Last year DS was in contact with another teen gamer ( age 14) who does intros and has a 'shopfront' selling them ( as well as graphic thumbnails etc).
DS sent him a 'brief' of what he wanted in the animation and the guy replied, saying that it was all fine etc and sent DS some examples of other intros he'd done ( which looked good).
It all looked OK so I let DS use my PayPal account to order this intro and pay 25 USD (about £17) which he was going to pay me back from his pocket money.
That was about two months ago and the animation guy hasn't sent anything and won't reply to online or Skype messages from DS. 
I had his direct email ( from PayPal) so last week sent him a formal-ish email ( from me) saying that since he hadn't produced the animation could he please refund my payment. No reply.
DS says he knows this teen is around as he can see him gaming online/posting videos and tweeting.
We could just write this off as a lesson learned, but if he is doing this to lots of kids then he could be fraudulently raking in hundreds of dollars.
He has quite an unusual name, and after about two minutes googling yesterday I easily found his home address and his and his parents Facebook pages, as well as his parents jobs ( LinkedIn). They look like decent, sensible professional folk. Do you think I should Facebook message them and let them know what's going on? Or would that just be weird?
If my son was 'stealing' I think I'd want to know?