INFINITI of Mobile

Purchased a QX56 the top is peeling beck to the sunroof and the catalytic converter is bad
My wife and I purchased a QX56 IN October, 5 are/or6 2017. My Wife feel in love with this vehicle. We was not looking for a car at the time. We was at the Nissan dealership getting my mother car service. Long story short I begin to notice the paint was peeling off the vehicle when I wash the vehicle. I took it back to Mobile Infiniti. Dean, the manager there gave me the run around telling me this is what it coat to get this part fix. Only had this Vehicle 3 months when all these problem start occurring catalytic converter my engine light cam on I took it back to shop Dean, the service manager told me the same thing again this what you have to pay out of pocket. Now granted I took out the extended warranty and none of this is covered. we only had this vehicle now for 6 months. Need help please