But upon accessing, it's the ISP that blocks the access. So Op is should just test where the cause of the problem is. If it's not the fault of the casino and your country is good with it then ask the providers or have a reset first and test if your dynamic ip will do.
What is dynamic IP and how to do that? Anyway I've heard someone changing their DNS to access blocked website, it's possible?
It's easy through resetting or restarting your modem. That will do, if you have a dynamic ip then it will automatically will change yours. If you're fortunate and that's the type of connection you have from your ISP. That's why you have to test and see if that's it.
But if not, you can try to call your ISP and tell them that you cannot access a specific website and that might give you the idea if they're really the one that's blocking you.