I am sorry for your lost.
You should move this topic to scam accusation board:
https://bitcointalk.org/index.php?board=83.0 with evidence, but your winnings are looking too high and too good to be truth, i mean, 0.8BTC to 5BTC in just few days smells fishy.
I did some basic research and didn't find much about the company (a couple of scam complaints but they were lacking in details).
Hm after you couldn't find much information about company, and after couple scam complains you still decided to put your money in that site? Why?