If you can document you did everything righteous and Ebay will not do the right thing, I suggest you close out the ebay acct.
If you want to sell in the future open another acct.
I've been shopping ebay for over 10 years. If a vendor has 1000 sales and 1 or 2 negs I don't care. If they have 5 sales and a neg. I most likely will move on.
Ebay unlike TPT is not a tight knit community. I understand you point of honor but, I don't think ebay is worth stressing out over.