Earlier quoted context omitted.
Are you in the Cayman Islands? It looks like that's where the owner of the gTLD, Internet Naming Co., is based. Did you mean commonwealth or common law? Either way, their pricing is in line with other gTLD providers and there's no sign that they didn't violate any territory's regulations or ICANN policy, so there's not really any reason for a judge to rule against the gTLD provider. A method for a more likely success…
common law. and both the registrar and the gtld have american entities you can bring to court. otherwise they wouldn't be collecting revenue.
It's also an awful place to start from, as a good-faith effort to settle the matter is much cheaper for both sides, and the only way to prevail when no regulations were violated.