I found out what to do! Apparently, in the first case, the seller is able to escalate after a length of time has passed (not sure how long, it was at least two weeks before I decided to do something about it). I went in to try and leave another comment/message on the case, and saw the 'escalate' button. I wrote a very long explanation quoting the description, and pointing out it was buyers remorse, etc. And they found in my favor, so that worked out fine.
In the second one, I was also able to escalate, and again, they found in my favor and I was able to get my fees back.