For a better understanding of just what warranty coverage Keystone provides is outlined in the generic owner's manual - link below.
It would be very unusual for a dealer to provide maintenance on something they are not going to get paid for. On the other hand, a dealer being glib about your problems is just bad management and hurtful to their dealership. I doubt you will use them again or recommend them to others.
https://www.keystonerv.com/media/914...anual-2019.pdf