Potential Ebay/Paypal Dispute?

So, forgive me if this is complicated, but I need insight. Ebay is the polar opposite of helpful.

December 8th, my mom purchased a 10" tablet from a seller. We received it, it worked, everything was great. After about a month, it started having issues that the charger port was lose and wouldn't connect well. We were still able to charge it via USB, but there wasn't reason for the issue. We contacted the seller via their own website and they offered a replacement (I have this original conversation). The conversation stated a one-week turnaround.

So, we ship it to them to be replaced. We sent it through UPS (only from California to Arizona) and it was signed for. A week went by and we heard nothing from the company. I contacted them again through their site, they claimed they were backed up in receiving, asked the tracking number, and said the replacement would be shipped in 3-5 days. Sadly, this conversation I didn't manage to keep.

It's now been another week without hearing a word from the company. I finally decided to make a claim through Ebay in preparation for when I contact the company again Monday (no weekend service). I am completely unable to find the seller nor the listing in the archived purchases though it's still listed in the Paypal. As far as Ebay is concerned, the listing never existed and I am not able to place a claim. On top of that, it's now past the 45 day limit that they seem to allow claims to be filed.

Backstory aside, does anyone have any input on what I can do about this? Is there a way to dispute this through Paypal without the missing Ebay listings? At this point, I'd be content with a refund, as they have the tablet and have had it for two weeks. Again, there has not been any contact from the company aside from my initiations.