You can also contact the Attorney-General's office in Louisiana regarding this issue. The consumer protection division of his office will be helpful to you if you continue to get no response. I'm disappointed that your dealer has not been more helpful to you, based upon your summary. He is the 1st line of defense when it comes to the customer's problems.
I do wish you well -- as a fellow Louisianian -- don't give up on the Ford Mustang line just yet. I believe a solution is just around the corner.
M-73