First of all I'm really concerned about what you experience with FortuneJack casino, because after all it's not the best solution if the user ends up experiencing something unwanted. Hopefully FortuneJack can immediately give you access to your account again with everything in it intact.
Back to such a long rule as stated in the FAQ at his casino
https://fortunejack.com/faq/terms_and_conditions states that at point 2 sub chapter 2.9..
We will block and terminate your account if you notify us or we have reasonable doubts to suspect that you are a gambling addict. You will be able to withdraw the remaining balance to your other account prior to such termination, however, you expressly undertake that you will not have any claim in respect of any previous activity held in your account, including, but not limited to, losses or victory as a result of the activity. We reserve the right not to reopen or validate your Account after it has been closed in accordance with this clause.
And many more rules that may be related to KYC is the submission of data to 3rd parties, along with all personal data of users by casinos affiliated with related companies. Everything aims to keep the security as strong as possible for its users. Although not everyone likes KYC.
I hope that if your case is true, and has solid evidence such as proof of transactions between the return address, casino recipient address and the appropriate date and time, then FortuneJack should immediately provide clarification and conclude a favorable ending for all parties involved.
Because as far as I know, gambling there since 2018 is still comfortable and has never experienced this kind of problem. So please don't let the OP give you an exaggerated issue. Without valid proof, we certainly hope you know what we want.