I bought a phone as a "NEW ITEM"; the item arrived without an invoice and with marks on the display

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I bought a phone as a "NEW ITEM"; the item arrived without an invoice, with marks on the display and without the user manual (the latter listed among the item details in the seller's listing). I asked for a refund, but he doesn't want to give it to me because he bought it in China and they didn't give him an invoice, and he claims that sending it back to China would cost too much.

What can I do? It was an item labeled "eBay Guarantee"

I am entitled to a refund.