I know this casino, had issues with its sister casino. It is the same company's casino like ExciteWin.com. Originally they had EMTA (Estonian) official license, but this year EMTA had removed ExciteWin's and many other Estolio Limited casino licenses off.. but interestingly recently EMTA has given license back only to Posido.com.
They also operate under Rabidi NV / Nova Forge Ltd.
Here is more of it: https://casino.guru/fi/foorumi/kasinot/excitewin-casino---yleista-keskustelua/4
I just saw you had already sent a complaint to CasinoGuru, https://casino.guru/fi/valitukset/posido-casino-pelaaja-ei-ole-viela-saanut-voittojaan-15 Hope it will help. According to this page Stellar Ltd is behind the casino, but according to EMTA's official list it's Estolio Limited (https://www.emta.ee/en/business-client/registration-business/gambling-operators/list-legal-gambling-operators#online) If you click there you can see Estolio's legal email, where you could also send a message.
Also, do you see what license they show in their website? Personally they have maybe blocked Finnish people to access their site, so I cannot enter it. But if your country site has that EMTA license, you can also escalate it to EMTA: hasart@emta.ee
Du blir snart omdirigerad till casinots webbplats. Vänligen vänta. Om du använder en annonsblockerare, kontrollera dess inställningar.