From looking at the listing, it looks like they may have intended it to be another bait listing, because the parking rack is still there for $24.69, while the prices for the item actually being advertised is now $54.99.
The revision history shows changes to the buy it now price 4 times, the first time on the 21st September, and then another 3 times on the 17th/18th October, with the OP's purchase being on the 18th of October and the only sale from the listing.
It could have been a mistake when they revised the pricing on the 17th, (or the 18th?), and the price changed immediately after the OP's purchase, which would have notified them of the error.
Which, of course, in no way whatsoever excuses them of the poor behaviour / treatment, regardless of their reason for it. eg A lot of sellers - especially ones who fear eBay more than they fear customer dissatisfaction - when an error or mistake like this occurrs (if it even was unintentional), will keep up appearances for the buyer until they eventually raise an issue, and then the seller will blame it on something else, like lost in the post, and issue a full refund, which in turn encourages the buyer to appreciate the seller and blame a third party for the problem, if the charade is believed.
These sellers are focused on not getting repurcussions that can affect their ability to sell, rather than what is best for the customer, unfortunately, which is testament in part to the seller's priorities, and part to the environment eBay has created for all sellers (and like I said, I'm not trying to excuse the seller's actions, or suggest that they deserved any empathy, I've always found being honest and up front nets more positive than negative so I would encourage and appreciate that no matter what, I'm more just posting for insight on the possibilities for why a seller may do things like this).
