How To Deal With A Scammer?

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First: Why can't I phone Ebay anymore? This is a complex issue and I don't know what to do about it! It needs immediate attention. 

I sold a pair of vintage prescription designer glasses last week to Joe. When I ship an item, I always put a Thank you note inside that includes my phone number. Last night I got a phone call from Fred saying that the glasses were described as NONprescription. 

It turned out that the buyer (Fred) had purchased them on Grailed, but phoned my number because of the note. MY buyer (Joe) had tripled the price, lied in his description, and listed them on Grailed, providing Ebay with his buyer's address, not his own. 

Apparently Fred has opened a Paypal case against Joe, and Joe has contacted me saying the glasses are NAD. 

I really don't know what to do! WHY CAN'T I PHONE EBAY?!

NOW what do I do? 

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It still makes my head spin! Had I wanted to refuse to refund, I think I could have just told Ebay that the glasses were returned broken. Joe couldn't dispute that since he didn't send them -- he never saw them! Didn't do that, though. I got them back as I'd sent them, and refunded Joe less my 20%. I know that Fred opened a Paypal dispute regarding Joe's sale to him, but I haven't heard what happened. I'll ask him. If he tells me, I'll pass it on to you! In any case, Joe lost the shipping fee and about $11 to me. I'm going to go get the lenses changed out and resell them!