I think we can all "feel your pain". The "tint" company was it a sub-contractor to the dealer? Did you pay the dealer or outside company? Did the seat get cleaned? If the seat did not get cleaned to your satifaction, you being a reasonable person, you would hold responsible, I would imagine, primarily the people you paid to do the job. If it was the outside contractor - recommended by the dealer - than you could ask the dealer to intercede for you, but do not ask the dealer to cover their liability on the job. The way it sounds rereading your post it is an outside contractor the dealer uses.
I hope it has been fixed, as it seems you are quite busy and frustrating when you try to do something for yourself and it gets screwed up. You have years of fun ahead - enjoy.