Alamo claimed Kayak provided the wrong reservation
Pros: For some reason, my Alamo reservation was handled by the Enterprise office. They fixed the incorrect charge quickly, bringing it down to my originally-stated reservation fee. They were efficient and professional (but as I said, they were not Alamo customer service agents).
Cons: When I dropped off my car, the charge was nearly twice too high. For some reason, my Alamo reservation was handled by the Enterprise office. They said my car was supposed to be returned in San Antonio, not Austin. Fortunately I had my original booking with me, which showed otherwise. They fixed the price for me, and they said the problem was Kayak had given them the incorrect reservation information.