The staff at the Mexican border had absolutely no idea what 'NAFTA TN Visa' was, there was no response of "We don't have a NAFTA officer on duty now, come back

The staff at the Mexican border had absolutely no idea what 'NAFTA TN Visa' was, there was no response of "We don't have a NAFTA officer on duty now, come back later or go to XYZ border crossing" it was "What are you talking about? We have no idea, go away."