Is There A Refund For The Cdw On A Canceled Car Rental?

I booked a full-size sedan with Avis through Orbitz. When I got there they told me all they had left were compact cars or minivans. Seeing as I did not want either of those (otherwise I would gave reserved one of them) I decided to go with another company. Luckily I chose the pay later option when booking. However, I did purchase the CDW from Orbits which they charge for upfront. I thought it would refund automatically but now my orbitz account thinks I took the rental. Thier customer support page is no help, so how do I get this refunded.