Went to buy a car there, and they have fee after f...

Went to buy a car there, and they have fee after fee on top of the advertised price. Finally agreed to a price and was brought into the finance room and it was locked so I couldn't get out. The finance lady tried to add fee after fee again and again, until finally I asked for my car key back( I was trading in), she kept trying to talk me into the fees, and i got up to leave and I couldn't because it was locked from the inside. At that point I demanded she unlock the door, and get my key, and again she tried to keep me there and finally I threatened to call the police, and she hit a button under on her desk that unlocked the door and I left.
Shady, and borderline illegal selling tactics with possible kidnapping salesmanship. Go anywhere else but here.