If I, for example, ask you to give me $100 and I will give you the team that will 100% win the Super Bowl 2017 I guarantee that. And then it turns out some other team had won and there was no legal contract only like a facebook message where I claimed that certain team will win 100% so can I get sue...
Investment broker recommends an investment that turns out to be a fraudulent scheme and broker knew or should have known the project was a scam.