Admin canceled my order how can i contact with them?

Admin canceled my order how can i contact with them?

It's very unfair with me. Listen i worked on a referral Sign up. But the buyer was very bad he give me all false details for sign up that's why my activities did not worked properly. And then we got  deal that i will back him 50% of this order. 

But now he report on support and admin canceled the order.
Right now i want my 50% of this order. Please anybody help me?