The only advice that I can give you is to move; no lawyers will do a pure contingency-fee (no win, no fee) basis, especially if it is gambling, because very few lawyers are aware of the casino's anti-cheat works and how issues on KYC and multi accounting, you will need a specialized lawyer for this.
It's better to name these casinos, post your evidence, and let the community weigh in on the issue. If your complaints are valid, the community will support you and give these casinos bad feedback if they have announcements here.