You are not going to get money back using the group approach.
He probably doesn’t have the money for an entire group of refunds for sure.
Your best bet to get your money back causing enough problems for him as one person for him to make you go away.
But you’re probably not going to get your money back from him. Ask your friend, if he’s a decent person he would do it.
The most you’ll get is a well learned lesson not to trust some random Indian guy promising cheaper tickets no one else can get. You’d have better luck going down a 
[edited by mod]