What do you want? Do you want the investment instead? Do you just want to warn the investors that they might be being tricked? Do you want them to start the co

What do you want? Do you want the investment instead? Do you just want to warn the investors that they might be being tricked? Do you want them to start the company and employ you (not a good idea if you can't trust them)? I suspect you don't have a case yourself unless you have great evidence about exactly what they said and even then in private the damages are probably small. The investors are the ones whom at the least charitable interpretation were being defrauded and may be most angry and have a case. I suggest that unless you want to pitch for the investment yourself that you stay fairly quiet or quietly let the investors know the situation and let them deal with it.