You need to try to contact him. I gave you all the information you would need to get in contact with the pool owner. Now it is your turn to get into action to try to get your coins back. (I don't believe you will get them back, as with this sum, he will most likely have taken off already...) {at todays conversion, that would be 200 BTC - I don't think he is that honest, especially that all his sites are down}