Unfortunately, with the way Apple Stores operate, people can end up falling into the cracks; I've been there myself, and have witnessed a store emptying out and closing around me while I waited at a table looking like the rest of the furniture, I guess. There was one other poor soul in the same boat, which spoke to the chances of such occurrences.
However, as others have suggested, the first step would be to ask for the store manager, who would have been able to assess the situation, and provide an immediate solution. That person may or may not been helpful, but it's an avenue that should have been pursued, and verified to be fruitless, or not.
When I had trouble, after hitting a wall with the Genius and the rest of the staff, I was ready to do the same and pursue a complaint with corporate, but happened upon the manager, who made things right. It was evident that I had reached the limits of what Geniuses are allowed to do (as well as the limits of that person's logical reasoning), but no such issues with the manager.
In the followup surveys about the service visit from corporate, I gave the store horrible ratings and invited them to contact me. They never did, which I took as a sign about how much they would have cared about any complaint I would have made had I not been taken care of by the manager.
That experience taught me not to return to that store for anything but an easy, straight transaction, and certainly not for any sort of repair. I will go out of my way to go to another store that is farther away.
Sadly, more recent experiences have taught me that, even for such simple needs, Apple's store processes still need improvement, and that the quality of the staff is continuing to decline.
The number one rule if one needs help is to find the elusive traffic cop with the iPad, check in and get in the queue, no matter if the store is packed, or empty (the stores really need one of those "Take-A-Number" dispensers, because that's how they actually function). I don't care if they ignore me if the store is busy, and I'm just browsing, as happens most of the time. But if I go in, with the intent to buy, and am ignored in an empty store because I didn't check-in, then something is fundamentally wrong.
In the latest instance, at a different store, the Watch table was the only one with any potential customers (bad weather meant very little foot traffic), including us, and had only one Apple employee trying to assist. Everyone else either walked by, ignoring the situation, or were engaged in some seemingly important busywork, oblivious to the need, including one of the non-drones with an iPad and radio. I had to hunt down the check-in person halfway down length of the store (it's one of the larger ones), and make it a point to check-in with them before they summoned additional help. That not how purportedly high-end retail is supposed to work.
