Then why did you created another account and gambled there? Technically, you have violated their rules. They can simply say that our system were not able to caught the duplicate account. But they have all rights to ban your accounts and probably they can freeze your deposit as  well (I am not sure, I didn't read the TOS). But, it was you who created another account by violating their TOS and loss your money. I see this as a attempt to play on a casino for free while if you could win, you would simply withdraw the funds and run away. 

@holydarkness I believe you can smell what is happening here. This should be marked as a invalid case.