@adamfwhite97 To clarify, were you actually hoping to upgrade to Pandora Premium, or were you only attempting to sort your collection by Stations on your Android device?
If you're receiving that error when attempting to upgrade to Pandora Premium, then it sounds like you may have more than one Google Play profile, or another Google Play account under an alternate email address. Unfortunately, I'm not able to search for that using payment information, since I don't have full access to the Google Play billing system. I'd recommend making sure you're signed into your main Google Play profile. Or, if there is another email address you'd like me to check under, please let me know and I'll be happy to see if I can find it for you. (That email address will end in "gmail.com.") Otherwise, you can reach out to Google Play directly, and they will be able to advise you using your payment information.
Let me know how it goes.
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