Verbale keeps your recordings, transcripts and notes on your phone. We never receive them, so there is nothing of yours on our servers to delete except the record that a subscription exists.
To have that removed, email admin@innocorelabs.com from the address you used, or with your Google Play order number. We will confirm within seven days.
Uninstalling the app removes everything it held on the device. Cancelling the subscription itself is done in Google Play, under Subscriptions.