I've had an invoice for items that I haven't been paid for on Ebay?

I put my iPhone on ebay and it was won by a bidder who then decided to do a U turn and not pay for it. I then re-listed the item thinking this was ok, which was then bought by another bidder, who two weeks on has still not paid, But has messaged me asking for my 'Paypal email' - dodgy to say the least. What do I do? We're talking like £50 here! Money I don't have!

Talk to eBay customer services

So why haven't you filed the unpaid item dispute? When that goes through, you get the FVF credited back.

A buyer may choose to pay you directly via your email address.
It may either be a genuine buyer who is having trouble with Paypal or a scammer.

File Unpaid item disputes on both 'sales'.

I'd personally compare an ebay sale price against Cex. With a 50 quid sale, you'll end up with 38 at most.
Takes an hour at most to get the cash, no listing fees, no selling fees, no paypal fees and no aggro.