Dealer making it impossible to get service

I have a 2012 Shelby GT500. Back in March I contacted Deysha here on this forum to ask for help with the 1-2 grind/lockout on my car. I told her of the circumstances that made this occur and that I needed guidance on where to take my car since no local dealer sold or worked on the Shelby. She in turn had a representative contact me from Ford Customer Service, I again laid out the details of what was happening and again stressed that the local dealer was not an option to go to since they do not sell or service the Shelby. Not 10 minutes later I get a call from the local dealers service manager who without seeing my car has already diagnosed the issue, told me it was a skip shift feature and it was normal characteristic feature of my car and to add insult to injury as he clearly had no clue to what he was talking about he further said there was no need to bring it in as he would not allow any of his technicians to duplicate a high speed or race style driving. I told him it's just 1st to 2nd gear the speed would be very low and in order for me to show him the term race style was opinionated it's not racing just a high rpm shift from 1-2 and it grinds and/or locks me out all together, he kept refusing so I just hung up on the guy. Since that time I have contacted several other dealers who want to help but for some reason this service manager who has never seen my car nor has any Ford technician touched or seen my car has put notes on my account with false and misleading information to Ford to where no other dealer wants to touch my car. How in the world is this possible? How can they refuse to even look at my car? What one dealer told me is Ford needs to give approval for any work now? I'm so lost what happened to a Warranty and on top of that I bought the Premium Care Warranty for an additional $2,600. Do I need to seek legal help on this as this does not seem right or fair.