this is a very tricky situation in which the casino should take into consideration that the other account that your brother has has not been used for 3 months, plus I don't see that another account would make you earn much on that account you said had 11 ethereum for them to cut your winnings, as I'm not a casino expert maybe I'm wrong and they're right, but I don't see how a second account can make the first account have many wins. anyway you at least have your ETH, better use another site because it seems to me that this site it's not providing good service, i see a lot of complaints
but let's imagine that the person lives in another country, how can you hire a lawyer in curacao without traveling to curacao? and if that person also travels to curacao, will pay for plane, hotel, attorney and litigation costs, all of this can be more expensive than the money that is retained in the casino