Sam immediately should stop investing there. And if Bitcoin uses legal on Sam jurisdiction then you may proceed report to police although I don't believe they would able to do anything since bitcoin is irreversible currency. However he might try his luck. Its seems Sam has been invested on Ponzi Scheme somehow and all ponzi scheme has been turned into scam eventually. To be honest, Sam is too greedy on your story. Why he should involved with it if he doesn't have enough knowledge? The result is scam, that's how greedy people are getting scam. This would be a lesson for other. Just stay away from them who are offering you hight return on investment.