I understand your son's situation is not a pleasant one, and I applaud your exposure of the people doing this, but it's pretty silly to be working for them if he's making a loss...
The only reason companies can do this is because people support it by participating in the farce.
I also did some work for The creative counsel, I was not paid what I was owed and they lied through their teeth. They have the worst reputation amoung varsity students and just function according to a grossly oblong work ethic! They need full time trainers because they have such high promoter turnover.
I would encourage you to just move on, there are lovely promotional companies who respect their staff.
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The only reason companies can do this is because people support it by participating in the farce.