Sadly, here at Vocal Image, we don't have access to Apple's App Store's subscription or billing details to cancel or refund these purchases. We do apologize.
Apple App Store has a separate system for billing and payment information, we kindly ask that you visit the Apple App Store customer care department for more information as for your account status and to arrange a refund: https://support.apple.com/contact or by calling their support number in your region.
In the meantime, please GO HERE to view steps on how to cancel your subscription and/or to ensure your subscription is canceled via your Apple device.