I found your post looking for the same answer. Just updating for anyone else in this situation dont lose hope. After going around in circles on the ebay website for about an hour with the case closed with a partial refund issued without my consent, just like yours and unable to access it to appeal/dispute as it was refunded (albeit partially). I was able to open a chat box entitled contact and automated assistant or contact an agent at the bottom of the page. Go to the chat box click a few promt boxes until you get chat with an agent, check that and you can chat with a real human. Yeah seems obvious but it is not at all. I was just about pulling my hair out in frustration before finding the answer finally. The agent rectified my problem.
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