Nitpick: If you do not choose the axiom of choice, then Banach-Tarski is independent, not false. So you can't prove that it's true and you can't prove that it's false.
Nitpick: If you do not choose the axiom of choice, then Banach-Tarski is independent, not false. So you can't prove that it's true and you can't prove that it's false.