Ebay Another ebay seller gets ripped off!!! Internet

I recently sold a iPhone 5 on eBay. Transaction went smooth so I thought. 2 weeks after transaction was completed customer said phone resets after using it on Wi-Fi to watch video. I never had an issue with the phone and suspected the individual had modified it in some way and suggested they take it to an Apple store to try to diagnose the problem. This would be the only communication I would have the buyer. A few days later a case was opened and quickly closed in favor of the buyer. I was never given an opportunity to tell my side of the situation. I was informed that I would have to refund the customer in full once the buyer shipped the phone back. However 2 days later EBay deducted a full refund from my PayPal account and I have not received my phone back. My emails to both the buyer and EBay are going ignored now. I will never sell an item on EBay again.