They already have your money...
I dealt with the same lack of return calls and excuses after I purchased my unit just over a year ago from Toyhauler Liquidators in Rocklin CA. Just wanted to get a badly warped interior door replaced. What a fiasco.. Finally just gave up and went to social media (Yelp, FB, etc..)to express my opinions about the dealer.
Lets face it, RV warranties are a joke and there aren't many dealers willing to make things right. Its all about getting the unit out the door and making the sale for most of these guys unfortunately.
I don't see your roof blowing off... Just a few wrinkles in the rubber. IF it really bothers you, cut it, lay it flat and run a piece of Eternabond tape over the top of it.
