Fezbet is not a pure crypto bookmaker but you can also use cryptos for deposit. I send a withdrawal request via ethereum and they paid me out with fake ethereum with zero worth! So they scammed me with around 500€. Even the scam is proofed through transaction hash, fezbet refuse to pay me out.
Where did you even encounter the site? Do you have that amount of money and just invested directly with the site?
Sorry for your loss. We can't pressure a gambling site if they intended to scam in the first place. The only thing you can do now is to spread the word about the scam site. Thanks for sharing your experience here and it should serve as a lesson to you.