Freelancer — Fraud in payment and robbed my money

Address:	Mysore, Karnataka, 570001
Website:	freelancer.com

I donno how to file complaint here. I registered with freelancer.com more than a month back and got a project awarded the same day. I didnt know the rules and procedure completely but was happy that I got a source of income just the time i bid a project. The employer detailed me about the project and we communicated well the first day. It was a 2 day project and the second day employer responded very feebly. later once I finished my project I sent the file to the employer even though there was no communication from that side.
I waited for my payment and could get no response from the other end. I raised this issue to customer support people who told they cant help me anymore after a couple of mails. But the website has deducted INR 250 from the registered credit card. Anybody please tell me why shoud I pay them when I have not received my payment? A person enters into that site for earning money. The situation is like I have spent my effort, knowledge to complete the project, didnt receive any payment and still gave them money from my own hand!
Kindly help me in this regard. I just want my money back which the website has taken, and I will just quit my membership from the site. I have all the relevant conversation screenshots. I can send you whenever you ask for.