Spray the bolt thread area with some penetrating oil then about 1hr later, give it a shot.
If you have the right size torx wrench the dealer wont be able to do anything you can do. They will just charge you extra since you will have to pay for their labor. Dont think they will just think they messed it up so they will have to pay. They will most likely see the bolts are damaged and say it wasnt their fault and you will have to pay anyway.
If you get them out make sure to buy new ones dont install the trashed ones,plus they are a one time use bolt. Also make sure to use loctite when installing the new ones.