Penske Chevrolet of Cerritos

On 9/10 I went to Penske Chevrolet of Cerritos and bought a certified pre-owned 2015 Camaro RS at what I considered a great price. I never test drove it on the freeway and as I was driving back to WLA I realized the engine noise is way to loud at freeway speed. My wife confirmed it the next morning when I started it up and it rattled the whole house. I realized I made a mistake and went back to the dealer the next afternoon. Apparently with certified pre-owned cars you can trade within 3 days or 150 miles for another certified car or a new one you cannot get a refund. I cannot afford to spend 35k plus for new and this dealer has maybe 6 pre-cars so I made the only choice that made sense and had to pay 5k more for a 2016 Chevy Colorado truck. I couldn't make a good deal because I had no leverage. Compared to Chevy Colorado certified trucks from other dealers on the internet which were priced lower and had more amenities I was over charged. My only choice was a WT model which stands for work truck. It came with scratches inside the bed which was very dirty upon delivery. The carpet in the back seat was worn away to the base in one spot. I was was only given one key and remote instead of two which is the norm. This truck only has 18k miles and the rest of it was clean. How could this truck be considered Certified? One thing I will say my sales woman Leah Sneed was wonderful and did the best she could under the [non-permissible content removed] circumstances. 25k for a work truck. I was ripped off. Penske Chevrolet you owe me at least $1500 to make it right