no refund
Response from developer
We sincerely apologize for the inconvenience this has caused you. This is not the kind of experience we want for our users. There was a system failure. And we have already fixed this error. We'd be happy to help you out, but as iOS developers, we are not capable of dealing with any refund issue. All the payments and refunds are processed and managed by the App Store. We suggest you contact App Store Support to deal with the refund. (please check this page for detailed information: https://support.apple.com/en-us/HT204084)