Real-time voice or video communication between users on mobile devices or computers
Unused Skype Credit cannot be refunded because this remaining credit can still be used to make phone calls from Skype Dial Pad site on the Web:
https://calling.web.skype.com/
Just be sure to sign in to this site with exactly the same account as you have used with Skype.
In the case your credit was deactivated due to not being used within the last 180 days, this credit can be reactivated from this reactivation site: