Went to the dealership because they had car i want...

Went to the dealership because they had car i wanted on sale because they were gonna wholesale the car to a different dealership. Took my 2 of my car into trade it in but they tried to basically scam me..They offered both of my cars a rough trade in value as in bad condition although both vehicles are mint condition with low miles and extra stuff on it. They booked my cars over 5-9K below nada value and when i asked them why they are taking it as rough trade in instead of clean like everyone else their response was because the car i wanted is on sale and they are giving discount on the car.I told the rep/financial guy this is pre-existing deal you guys put out and advertised but they said it doesn't matter. WHAT A JOKE. Horrible dealership and waste of time. Will tell all my family and friends that never go to this dealership ever again - long time customer