Terrible sales experience

The absolute worst service I have ever experienced from a dealership. First I bought a demo which had 10 things wrong with it like dents scratches... The sales agents have excuses for everything... Had to go back over 5 times. Let alone the fact that my car that I traded in was sold privately for a 30k profit but apparently my car was old and couldn't get a cent more... Later found it online trading for double the price I traded it in for. Don't trade your car in with them or buy a demo because they will tell you the car is perfect just to make the sale and once you bought it they take 50 years to fix everything and make excuse after excuse. Absolutely pathetic... They act like they doing you a favor by fixing a demo vehicle which should not have so many defects in the first place.. Its probable their demo vehicles are driven badly.