Of the non-GT models: Good, Better, Best. That about sums it up.

This should have been disclosed to you prior to completing the paperwork. Decided what outcome you want and be direct. The fact that the GM was casual with you and formal with another client’s honorific is a lever that you can use in your discussions with him/her; every client deserves and should receive the same respect. They may put up a firm defense, but when they see that you are calm, and purposeful in your resolve, I imagine they’ll come around.