[Eric72]

I won an eBay auction held by Probstein 6 days ago. The item hadn't yet shipped, so I sent a message this morning, asking for tracking. Their reply:

"First off, thank you for the bids and interest in our auctions. We regret to inform you that due to an ebay glitch this item was double listed and
we no longer have anymore in stock. Please open an ebay dispute and we will process you a full refund.
Thank you."

I found a previous listing from roughly two months ago, when the exact card (cert # and all) sold for around 40% more than my winning bid.

My question is this:

What would you do in this situation? So many options on my mind at the moment. Trying to think things through before acting.