“Report a Problem” website sign-in issue?

[RollTide1017]

I’m trying to use reportaproblem.apple.com to request a refund for a movie. The movie is Superman: The Movie and it is not in the correct aspect ratio. I have already bought the other version, Supernman: The Movie (Special Edition) which is correct. So I’d like to request a refund from Apple for the first one and, the links in my purchase history in iTunes eventually take me to the above mentioned website. When I try to sign into this website with my Apple ID, I get the following message:

You must use an Apple ID that has previously been used in iTunes. Sign in again with another Apple ID.

This is the only Apple ID I have or have ever had. I use it all the time in the iTunes Store. Has anyone else had this problem? Is there any other way to request a refund?