Why are my local business listings stubbornly clinging to outdated NAP info post-aggregator sync?

Alright folks, I'm pulling my hair out here with what should be a straightforward task in business listing management. Recently, I went through the whole song and dance of updating NAP details—you know, the address, phone, website—for a client across all the major data aggregators. We're talking Factual, Infogroup, Neustar/Localeze, the whole crew. The expectation, naturally, was a smooth, almost magical propagation of these sparkling new details across the web. Because that's how it's *supposed* to work, right? You tell the big guys, and they tell everyone else. Well, apparently, some of the 'everyone else' decided to take a permanent vacation from receiving memos. Here's the head-scratcher: I've logged into the aggregator dashboards, and lo and behold, everything is green, everything is correct, showing the beautifully updated data. Yet, several key local directories—I'm looking pointedly at Yelp and Foursquare, you two are the main culprits—are still proudly displaying the *old*, incorrect information. It's been weeks now, not days, *weeks*. They're acting like they're running on dial-up from 1998 and just haven't connected to the internet yet. It's beyond frustrating. What I've done so far, in my increasingly desperate attempts, includes: manually verifying every single aggregator dashboard (all correct, as mentioned); checking the individual stubborn directories multiple times over these agonizing weeks (still outdated, every single time); waiting patiently, assuming it's just slow propagation and that eventually the digital gods would smile upon my efforts (they haven't); and, of course, the obligatory browser cache clearing and incognito mode checks, just in case my computer was playing tricks on me. None of it has made a lick of difference. The data is stuck. So, I'm reaching out to the collective wisdom here: Is there some secret handshake, a hidden incantation, or a specific trick that one employs to force these particularly stubborn directories to finally refresh their data from the aggregators? Or am I fundamentally missing a crucial, perhaps obvious, step in the whole aggregator sync troubleshooting process? Are there any specific tools or advanced strategies for dealing with data that seems to be in permanent propagation limbo, stubbornly refusing to update?