So, let me get this straight:
- You "invested" in a Ponzi
- You expected big returns
- You lost the "investment" because the Ponzi crashed
- You want to get Cryptodouble to court, because you were so stupid to "invest" in a ponzi

You do know that ponzi's are illegal in most places, right? So even if you get enough people, nobody would be stupid enough to go to court, because playing in a ponzi is illegal as well. Don't play if you can't afford to lose it.