I would never suggest a partial refund in this situation. If he's already fired off 30+ messages in spite of you offering a full refund, there's no way giving him a partial refund of any amount will "just put an end to this" or make him a "satisfied customer" (unless he's making the whole thing up to scam a partial refund). Just be simple and polite, but direct, in your responses to him, and ask him to return the card if he is not satisfied with it. Don't feel obligated to respond to every crackpot accusation he levels against you, because again, that is unlikely to make him happy and will probably just add fuel to the fire.
As far as eBay is concerned, the only thing you HAVE to do is give him his money back upon return of the card, and possibly pay his return shipping if he requests.
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