I work in the industry. Make a real good product. Only to get it hacked by a dealer doing stupid add ons and pissing off customers. Much like the original post, they blame the corporation that made the vehicle, when the whole problem lies in the dealer that is selling it.
In the united states manufacturers are not the retailers. Tesla is the exception. And in some states are not allowed to sell the cars because they don't go through a dealer network.
To some extent you can even make the case with cell phone providers. There are corporate stores that are generally the better place to get the hook up, and the retailers reselling the corporate services. The crappy little kiosk in the mall place. The best cell phone setup I have ever had was buying a cell phone directly from the manufacturer and waling into a corporate cell phone provider store. Skipped all the reatailer BS. And that is the issue with the bad dealerships, they are just a retailer reselling the product. The dealer has no real say on a warranty claim. They do the work on good faith that they will get the money back when it is submitted back to corporate. Once the service department gets burned with a couple of good faith losses, they won't warranty anything that is borderline.
Now the service advisers make a cut of the services sold. The more paying income, the better boat payment they can make.
complaining to the dealership you will get blown off. They have too many other cash cows they are milking. But complaining to corporate, that does good. You won't see it. But it gets a tick mark against that dealership. And if they start getting a bunch of those tick marks against them, the corporate overlords will start to notice. Now they start sticking it to the dealership. Lost discounts, lost bonuses, dropping from the preferred status, severe enough they could even loose the franchise. Complain to corporate, be nice when doing so. IF you go off the handle you will be blown off as the problem instead of the dealership. Give details. Accurate information. The name of the service adviser and the tech (those will be listed on the work order). The work order number as well. That helps establish that you have your act together and gives easy information when the district rep stops by the dealer. They are not looking for John Doe that had a complaint and not be able to figure out which repair order they complained about. They will know exactly what is going on.
Three possible concenqunces. Nothing happens. At least that you will see. The dealer will be pissed at you, which will be mutual and you can avoid each other. Or the dealer eats crow and gets better. At this point you have lost nothing, and have the potential to make things better.