I have not played over rocketpot.io and in your case it was a normal airdrop and you received your funds but they have condition setup for withdrawal as mentioned by you.
To make a withdrawal, you’ll have to bet your deposited amount three times. The site’s terms say that Rockepot.io will process your withdrawal request within 24 hours, but you may have to wait up to seven days after the KYC (Know Your Client) process finishes.
@OP: Do you get any information on how many percent is roulette game counted towards wagering requirement? Usually table games has low percentage or even does not count towards wagering requirement. My suggestion, play/wager $300 on slot games as it is usually counted 100% towards wagering requirement then try to withdraw. If the same error still exist means that there is other requirement to be completed but we do not know what is it since you said that you get no T&C attached on the email.
Wait, but that may be exactly what the website wants.
They prevented OP from leaving them with airdrop, so he’d continue playing and get involved with them again. They probably didn’t expect him to win that much, so they’re not responding on purpose, and probably waiting for him to play all that money in their casino. With slots, he can just lose $300, which is fairly earned and is present in his account right now.
I suggest OP knock on those doors and try to get more information on what exactly does he have to do to be able to withdraw. Maybe it’ll take a while, but at least the money will still be there.