I only hope you aren't reading this because you've already been scammed by these crooks. This company does not typically respond to reviews. 7BitCasino ranks 5th among Casinos sites.
That is the literal definition of fraudster scammers. 7BitCasino has a rating of 2.92 stars from 49 reviews, indicating that most customers are generally dissatisfied with their purchases. What's worse, I won a significant amount of money without any depositing issues and immediately after that win my account was suddenly locked out. I've used Mbitcasino many times with ZERO issues even though both casinos are supposedly regulated by the same jurisdiction. After hours of back and forth with support, they will tell you to email and you will never get a response other than the basic automatic reply with a ticket number.
Their online support will leave you hanging for literally hours at a time with suggestions to 'change your password' or 'clear your browser cache' after the casino logs you out automatically and gives error messages when trying to log back in. They will allow you to deposit hundreds upon hundreds of dollars until they decide they don't want to pay you out when you win big.