I sold a playstation 5 console on eBay. Clearly stating the console is banned from Sony services and a picture of the error messagem my listing states no refunds due to the nature of the item. It is faulty as it's banned from Sony services.

So the customer has received it and now opened a case saying it's defective. I already told them it's defective and confirmed through message it's defective and they were ok 

Now they opened a case saying it's only good for spares and it's defective .

What can I do. Ebay only give option for partial refund and return