If you filed a 1040 for the tax (now under dispute as being ) owed, then you did verify this contract, and you violated it, so now the IRS uses their corporate court to administer the contract dispute (UCC rules, no Constitutional rights in that court, as no actual humans allowed in there, only corporations). There is no after the fact way to avoid this outcome that I have seen work. You can try making your demand for lawful money retroactive by denying that you ever intended to use Federal Reserve credit, but that is an iffy approach which they may or may not honor. True you were not given full disclosure, and thus no informed consent was given, but the filing of the 1040 will likely prevail.
Freed
If you had not filed a 1040, then you could take the case into an Article III court, representing yourself in personam, and introduce your Constitutional rights. Then you might prevail on the lack of a valid contract, as other suitors have successfully done. Once in the IRS court, no one has prevailed. Joseph Schiff got ten years in prison from this court, and he never got them to tell him the law under which he was prosecuted. Remember, the IRS court is under color of admiralty, operates under UCC, and 'you' have no rights, only implied contracts.