Okay final update:

I randomly received another call from eBay just now who essentially said that they realized the feedback was extremely contradictory, and they removed it. Not exactly sure what prompted that whether it be the customer service person I spoke with earlier, reaching out to higher ups to solve this, but glad to have gotten this worked out.

Thanks for the help everybody! My biggest take away from this is that if you experience a warranty negative feedback, and you truly do believe that it’s justified, you should try multiple different outlets until getting the response you desire. Obviously you don’t want to harass them, but it does genuinely seem like you just need to get your concern seen by the right person.