I seldom sympathize with rants that end "I'll never buy another XYZ again" when someone has a frustrating experience with some part or service. It's an emotional over-reaction.
Interesting that an interior panel is called a "cover". I'd have thought that would be an exterior part, but no biggie. Many interior ceiling panels are secured by adhesive, and that adhesive can fail. But whether it's secured by adhesive or fasteners, it can be repaired. Dealers often don't "repair" stuff, they usually replace stuff.
My suggestion: go to a body shop, not a dealer. A good body shop deals with this stuff all the time. Dealers are always the most expensive option, so don't go there unless the work needed is dealer-specific.