Sorry to hear this happened, sadly I don't think you can do anything but come up with a new name.
To take any legal action would require a copyright, but even still this is crypto, full of scammers who can hide behind a computer and take money without a trace, so even still that wouldn't work in my eyes.
Thank you for understanding. The worst thing in such cases is that it raises mistrust to the industry, and hinders good players to raise funds for development (((
May be you know where else on BTT or other resources we can alert?