2 years? This doesn't make sense. Did you send that amount 2 years ago or did you send partial amounts which add up to 0.4 BTC throughout this duration op? Either way, this was a stupid move since there are far more legit sites out there in comparison.
Try contacting
https://bitcointalk.org/index.php?action=profile;u=116564 who handles their thread in this forum(He has not been that active lately though).
He must have sent it partially accumulated for 2 years. By that time he should've gauge or even have known by himself if the site is legitimate or not. You should've posted screenshot as post or reference for your post and contact the admin or their thread here. If you hadn't had any problem before your address qas diaabled there is a bug chance that their site had closed and there might be no way to get your money. Good luck and this will be an expensive lessone for you.