You really need to contact that site. I am not a gambler so not to familiar with them. But this is not really technical support for them here. So email that site and ask what is going on. If they are not answering ... there is not much the forum can do to retrieve the BTC.
If you don't get paid and should have then look into posting in scam section. That would be next step if you were scammed.
My other bets are going okay but this 2 bets are pending since Dec 31, 2015. There support is really slow in answering my issue.