Google has forgotten the plot. A quick tangent story follows: I attempted to add a Tesla Supercharger as it went live to Google Maps. I was the very first to pay to recharge at the new location. The process went something like this:
1st time: Uploaded 4 photos, local business info, current charger prices, and GPS coordinates. Google replied this would be sent to human review. It was rejected within 6 minutes.
2nd attempt: Uploaded 6 more photos, including shots of local business hours and info, and current prices. Rejected in 6 minutes.
3rd time: One photo of a new charger, no description. Rejected in 6 minutes.
4th time: Appended all above details to local business info. It went live within a minute.
5 days later: Supercharger location was added by ??? and included no info at all and the pinpoint was off by 100m.
I've found that if you attach any pictures at all: rejected.
So what I've taken to doing is adding the business without photos (almost always accepted), and then trying to attach the photos later after that goes live (mostly works). But I agree, their process is completely broken, and I doubt they have any incentive to fix it.
Had similar experience trying to add a restaurant to Google Maps, our own even. First time, rejected because didn't exist, it did. Second time, they say they sent a letter, and they see that someone received it, no one did. We wait a month, they say they sent another letter, we wait another month. Nothing, and now they stopped replying too. Wait another month, suddenly the restauarant magically exists on Google Maps, with the wrong images, wrong address, wrong open times, but the pin is the right place at least, so I guess that's cool. Took another month or two to force through all the corrections too.
This was made 2-3 years ago, probably worse today. Absolutely horrific experience, and they have zero motivation to fix it, because people like us still want to be on Google Maps, especially if you're not in a super good location, so people can actually find you.
I tried to remove a not-anoymore-existing company I had a business profile before from Google Maps. I was close to giving up, it's such a complicated process that is fully intransparent.
Kudos for you for trying 4 times.
FWIW, editing OpenStreetMap is very straightforward*, and with that, you're actually contributing to an open data set that everyone is allowed to use, rather than just propping up Google.
(To be fair, on a laptop - I'm sure Google Maps is more straightforward on a phone. But for someone already prepared to invest this much effort, editing OSM should be well within range. And if you just enjoy contributing to maps, for a phone I can highly recommend https://streetcomplete.app.)