We are sorry to hear that Nebo doesn't fit your needs. If you wish to tell us why, we would very much like to hear from you!
To get a refund, you'll need to contact your app store directly. This is due to privacy and security reasons: Applications don't have your payment information, the transactions are done through the stores.
- iOS, App Store: https://support.apple.com/en-us/HT204084
- Android, Play Store: https://support.google.com/googleplay/answer/7205930
- Windows, Microsoft Store: https://support.microsoft.com/en-us/products/microsoft-store