Will try to make this short and would really appreciate any advice/help
Sold a Dualit toaster (brand new in box but box had been opened as it was a duplicate wedding present - had listed photos and explained box had been opened.
Almost one week after the buyer bought it I had to chase him about payment. 'Will pay in a couple of days' was his reply
Finally got paid and posted it tracked the next day. Two days later, without contacting me first, he opens a case with eBay to say item not as described.
He says the toaster isn't the one shown on the outside of the box. I honestly don't think it is different - why would it be different from the one on the box but without having it in front of me I couldn't swear to it.
Pain in the bum but ok I told him to send it back tracked and I would refund him the full amount. That was one week ago and have heard nothing from him. Messaged him twice during the week to ask him to send photos of the toaster so I can see it and also to let me know when he will be posting it so I can expect it back.
Nothing from him at all. eBay, as always, just send generic emails to bag questions I have.
It's been long enough now that I can escalate to a case but do I want to do that? Is that in my interest or will they just side with him and let him keep the toaster and the money.
The money wasn't little it was around £90 which was to be used for Christmas and at the moment it's being held so the sooner this is sorted the better. I'm getting paranoid and worried he's lying and I'll be out the money and toaster. 
Please help!