If you purchased your Vocal Image subscription through the mobile app via Google Play, you will need to contact Google Play Support in order to get a potential refund.
You can contact Google Play Support at https://support.google.com/googleplay/gethelp
In the meantime, please follow the steps below on your Android device to disable the auto-renew feature for your Vocal Image subscription:
- Open the Google Play Store app
- Tap your profile icon in the top-right corner
- Tap "Payments & subscriptions" and then "Subscriptions"
- Tap the Vocal Image subscription
- Tap "Cancel subscription" and confirm the cancellation
Here is a video that visualizes the process: