They don't have to refund your money at all (I'm not saying they won't). If the movie in question is not in the archive
(was never directly uploaded to WCM), then it's not available for premium download.
If the movie is in the archive but broken, they still aren't obligated to refund you (listed under "Availability of Service" on the TOU page).
With that said I won't disagree that the website is barren as compared to five even two years ago. The best you can do is to either post your dead premium links in the official thread or shoot a support email