Any lawyer would take your case, but honestly i dont think you need one. You explained it very easily, they agreed to the protection being put on, and that means they authorized the process to be carried out per the manufacturer. You should have a rental car as long as the repairs take.

As long as you dont have anything that says you ARENT allowed a rental car past 11 days, they have nothing. Inform them of impending legal action, within a week they will just cough it up. Its not worth it to them to pay thousands in legal fees to get out of a rental car. Whats a 72 day rental cost anyway? Enterprise can just convert it to a monthly rental im sure. Prob $2000?