Flybird, I have said nothing to suggest I think the broker was correct about anything--except his refusal to give you a copy of the
registration. That's none of your business until you've made an offer and had it accepted, regardless of who and what the broker may be.
I only remarked that under US laws, and the laws of most venues, you've got nothing that you can do to "punish" the broker, because you've suffered no actual monetary losses, and you've got no proof of anything he might have said. So there's no prosecutable crime, and no evidence of any crime.
Fifty years ago, you could go to a local dockside dive bar, or a private "social club", and pay a couple of goons a hundred bucks to beat the broker within an inch of his life, and cut his lying tongue out. (That's gonna cost a bit extra.) But these days, that's considered socially unacceptable, and good help would cost you five or ten grand, minimum, not just fifty bucks.
And of course doing that yourself, again politically unacceptable, violation of forum rules, exposes yourself to all sorts of risks, unless you're from a rare background. Generally not something to consider.
So there's nothing you can do about it, from what you've said. But feel free to contact the authorities in your location and his, and see what they say. Perhaps they'll ask you to set up a sting and wear a wire. More likely they'll say "Nothing we can do about that."