The NAVIGON app for iOS can be purchased exclusively via iTunes or Apple App Store.
The app is provided and sold by the Apple (iTunes). Therefore please contact the Apple customer service directly if you have any questions regarding a refund or the payment of your order. (regarding your new Apple ID as well)
You can contact the Apple support via the following link:
Please note that the terms and conditions of the App Store and the Garmin Wuerzburg GmbH apply for the purchase of the NAVIGON app and any In-Apps.