I checked your account using the email address that you use here in the forums, but I don't see any order history. Did you purchase using a different email address, or order via the Reader Mobile app? If you did purchase via the Reader Mobile app, then those purchases are handled via the Apple App store, and need to be refunded through the App Store as well.
Beware!!! I signed up for monthly payments to an annual subscription and Adobe tried to make me pay £100 cancellation fee after using the software for jsut one month. They do not make it clear AT ALL when you sign up that there will be a cancellation fee nor as to how much it would be. No other software subscription does this. It's absolutely absurd. The first person I spoke to about this had exactly the same experience with Adobe. Sort this out Adobe - you can't rope people into a year's worth of monthly payments with just a couple of clicks. It costs you absolutely nothing to cancel someone's subscription - it's a vertiable scam!
I checked your account using the email address that you use here in the forums, but I don't see any order history. Did you purchase using a different email address, or order via the Reader Mobile app? If you did purchase via the Reader Mobile app, then those purchases are handled via the Apple App store, and need to be refunded through the App Store as well.