Do not send them any more money. It's a scam and please report them to your local police and bank and then follow all the proper procedure to report them ASAP. The more victims stepping forward, the authorities will do something about it.
Their site is hosted by Cloudfare which is a US based company. If you are certain you cannot get your money back then you can contact Cloudfare directly and report this scam. At minimum, CloudFlare can remove the website and ban them from hosting on their servers.