I saw a black 2011 Chevrolet Traverse LT with 80k ...

I saw a black 2011 Chevrolet Traverse LT with 80k plus miles online priced;at $9700 and made an appointment with Linda to test drive it in Westminster, on July 22nd 2019. To my surprise ,I was shown a 2015 model with more than 101k miles with a filthy interior for more than mid $15k. The filth inside turned me off. Worse was the negotiation about pricing. The mileage was wrong because it reads 90k miles on the window ; way below the actual one. When I asked about the one I saw online Linda confirmed its availability; I was told by the dealer that someone beat me on it. It has been almost a week and I still am very disappointed from that bad experience.
Thank you and be aware!