Also if they actually managed to do that good luck collecting. Contrary to a corporation he would just go bankrupt and malpractice insurance also has caps as far as I know. At least that's how insurance works here.Class action are usually a group of people who suffered some form of damage suing one big entity for compensation.
You would have to do a case for each collection agent and prove for each individual case that deceptive practices and fake legal documents caused damages.
Honestly, there is no way Joe comes out of this not looking scummy. And it will be very telling who on lawtube will cover for him.