He's not a customer, he is a egotistical, self-entitled jerk!
You did the RIGHT THING! offering a refund and staying polite.
We all get such jerks pretending to be customers from time to time. Not worth losing any sleep over nor wasting more time with emails.
If you can, set-up an auto-responder for that email domain:
"We are disappointed that our product fails to meets your needs. Please uninstall the app and accept our refund and you will no longer have any more problems with this app."
You did the RIGHT THING! offering a refund and staying polite.
We all get such jerks pretending to be customers from time to time. Not worth losing any sleep over nor wasting more time with emails.
If you can, set-up an auto-responder for that email domain:
"We are disappointed that our product fails to meets your needs. Please uninstall the app and accept our refund and you will no longer have any more problems with this app."