Sorry about the inconvenience.

Here is their ANN - https://bitcointalk.org/index.php?topic=5449633
Here is their Representative - https://bitcointalk.org/index.php?action=profile;u=3549073

I am seeing some complaints similar to yours. So much for a "decentralized" casino
1. https://casino.guru/dexsport-io-casino-player-s-winnings-withdrawal-declined
2. Dexsport.io HUGE SCAM

I would be cautious dealing with this casino as of now.