I checked their domain on whois.com and the "status" of their domain is "client hold" and "client transfer prohibited". I looked around what those means and found these
clientHold
This status code tells your domain's registry to not activate your domain in the DNS and as a consequence, it will not resolve. It is an uncommon status that is usually enacted during legal disputes, non-payment, or when your domain is subject to deletion.
Often, this status indicates an issue with your domain that needs resolution. If so, you should contact your registrar to resolve the issue. If your domain does not have any issues, but you need it to resolve, you must first contact your registrar and request that they remove this status code.
clientTransferProhibited
This status code tells your domain's registry to reject requests to transfer the domain from your current registrar to another.
This status indicates that it is not possible to transfer the domain name registration, which will help prevent unauthorized transfers resulting from hijacking and/or fraud. If you do want to transfer your domain, you must first contact your registrar and request that they remove this status code.
Not accessing it as well from my side. What exactly was the service about? Exchange? Web wallet? Crypto casino? We have been told several times never to keep coins in third party noncustodial services. This is a classic example of what could possibly go wrong. Sorry about the bad experience. We hope you find more answers into this case.
it's a crypto casino, casino.guru gave them a 5.2/10 on their review.