If you're seeing duplicate charges or anything to do with a purchase that doesn't make sense, we'd love to take a look. You can get in touch with us by filling out a request here.
Apple Support Team handles all billing issues within house, including refunds. If you're seeing duplicate POF purchases that were billed through iTunes, you'll need to get in touch with Apple Support where you can request a refund.
If you made your purchase on your Android device through the Playstore, it was most likely processed by Google Play. We encourage you to contact Google Play Support so they can take a look.
If you made this purchase using Paypal, and you're seeing that the purchase was carried over, it means that your membership was renewed. If you're wanting to turn off your rebill status to prevent future renewals, you can manage your recurring memberships by logging in to your Paypal account.