When you refunded did your buyer open a return case and did you get your item back before refunding?
I hope you didn't just refund because your buyer asked you to. If so you won't get your item back now unless your buyer voluntarily sends you the money.
You should never call your buyers on the phone, any questions/queries etc should always be done through ebay messaging.
I think you need to read up on the ebay Money Back Guarantee so you know what to do when you encounter things like this again.
https://www.ebay.co.uk/help/policies/ebay-money-back-guarantee-policy/ebay-money-back-guarantee?id=4...
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