MySudo for iOS:
MySudo will have no control over refunds or purchases as they go directly through Apple.
According to Apple’s Terms of Service, all sales are final, but this article points out some purchases that can be refunded if Apple agrees to do so.
MySudo for Android:
Google does not give refunds for most Google Play purchases.
Please see the following for further information and to request a refund from Google: https://support.google.com/googleplay/answer/2479637