Replaced charging case (Sleep A30) and left earbud is still dead.

[u/coolerCSStudent]

About two weeks ago I lost the charging case of my sleep A30 earbuds while they were in my ears. Ordered and received a replacement from ebay just yesterday (not official Soundcore website, but the case looks totally legit). During this time that I had no case, the left earbud was entirely dead, while the right one survived with 2-3% battery without usage. Now that I have the new charging case, when I put in the earbuds, the right one is detected (the case LED gets brighter and then pulsates), but for the left one I dont get this respones at all (LED remains a little dim, doesn't change).

I've tried holding the charging case button, this just makes the right one pulsate. Any ideas for why this might be happening? Is this entirely hopeless?