How long has it been since your account being locked? If I understand things correctly, your
past case with 500casino was a simple matter of waiting while your account being investigated, is it perhaps a case with similar nature?
500casino approved withdraw only after casino guru accepted complaint. Now casino guru are absolutely unfair site. betsofa.com scammed me with 15000 euro, but casino guru closed complaint.
At this moment only vavada.com and bspin.io make withdraws without dirty unfair tricks. this is 2024 year reality.
If I may repeat what I wanted to know, how long has it been since your account being locked?
500 casino releases your fund and unlocked your account after their investigation finished. I'd like to think it's not due to your complaint at casino.guru, given on that platform, you stated that,

which heavily implies that they're yet to do any action.
If you can move this thread to a scam accusations board and supply it with adequate supporting evidences, I'll give my best to try and exhaust many methods to reach them and get them to come back to the forum. Though I can't promise you anything.