I don't know who to contact at Amazon App Store. And its more of the "principle" of it, than it is the 99cent fee.
Last night i went into the Amazon App Store and downloaded the Meteor Brick Breaker, the free app of the day. The $3.99 was grayed out and lined out and FREE was next to it. Then I noticed on a list underneath that, it said Tune In Radio Pro the 99cents was grayed out with the line through it, and it said FREE next to the app. So I downloaded that as well.
I check my email this morning to find out I was Billed and charged 99 cents for the app. Sure enough, I looked today and its no longer offered for free, but I know what I saw when I downloaded it. I already had the basic version, and knew if I had to pay 99 cents for it, I wouldn't have bothered.
I cannot find anywhere on the Amazon.com site to report this error, and for 99cents and the time I already put into looking around, Its probably not worth it.
Its the principle of it. it was shown on their site for FREE, then I get the email that I was charged. Has this happened to anyone else? I guess the lesson learned here is.... Not everything that says its FREE on the Amazon App Store is actually FREE!