So Enterprise (National's parent company) left a comment on my review asking me to email them about the situation. So I did, and then got the email rejected because they didn't recognize the email address. Then I used their customer question form from their web page, and was told in reply that they couldn't help me without a rental agreement number--which I didn't have, of course, because they never rented me a car (see original review about them not having a car for me).
Do you know what's awesome? When a company's attempt to appease a customer is just as incompetent as the service that drew said customer's ire in the first place.