AJA Champion Auto Club Selling a Car they dont' Own? Hooksett New Hampshire

Joe advertised a 2006 Navigator on FB marketplace for sale at $6000.  When we called it was his personal number, acted like this was a private sale.  Made appointment to see, told we were drviing over 2 hours and didn't want to waste time.  When we got to location, it was AJA Champion Auto club, vehicle was there with a $6995 price sticker in window, Joe didnt' work there, and they had sold the vehilce the night before. No one there claimed to know anything about us and the deal with Joe, but with their shoulder shrugging, and looks back and forth, somethign was off.  

We yelled at them for being jerks, and wasting our time, and they treatened us (we are seniors) took photos of our truck and gave us the finger.  Who is sellign their cars?  Are they sellign cars that are not theirs?  Is someone selling cars for them behind their back?  What games are they playing?  BTW - the State of NH has numerous complaints against this company.  We would have checked them out before, but we were told it was a personal sale not a car dealer.  Hmmm.