Just report him to the authorities. Be detailed, don't be threatening or belligerent. Doxing him mom won't do anything, but get enough fraud reports in and they might get something done. You can also report him to the Saskatoon police.
http://police.saskatoon.sk.ca/onlinereporting/Users can also report him to Saskatoon Crime Stoppers. If users have suspicions about PB Mining running a scam, these reports can be submitted here and the SPS (Saskatoon Police Service) will look into them.
Here's a link to Crime Stoppers:
http://www.saskatooncrimestoppers.com/home