What !!!!!!
I just send 15ETH to 0xbdb470934d6b7439527b936adf87fdf771364e1a
Please help me ! what can i do now

Unfortunately you sent to a PHISHING WEBSITE, A SCAM WEBSITE. We have been constantly posting the correct address in slack and here and been warning everyone to double check. Unfortunately scam websites are appearing for most big ICOS now that is why we urge INVESTORS ALWAYS TO DOUBLE CHECK CORRECT ADDRESS WITH CENTRA STAFF BEFORE INVESTING. Sorry for your loss. btw I am not CENTRA STAFF, I am just a fellow investor trying to help out.