In the end what worked for me was registering as google maps client/customer, reproducing the issue via API, and then reporting it as an API issue. The underlaying data was fixed within a day or two, and I got my emails answered by google engineer within (literally) minutes.
I recently moved, and found out that virtually every single web site from my credit cards to my bank to the library uses Google to verify address entry on the fly. The problem is that Google's database entry for my address is wrong. So any time I try to enter the address "123 Oak Street, Apartment Q" Google unhelpfully corrects it on the fly to "Oak Street, Suite 1." No amount of keyboard jockeying can override Google's on-the-fly autocorrection.
The solution I eventually came up with was to turn off javascript, then enter my correct address, then turn javascript back on to finish the rest of the form.
Of course, there's no way to contact Google about its error. Maybe in Google Maps? I dunno. How do you find an address that Google Maps doesn't know to tell it that the address it has is wrong?
(please do not take this as an endorsement of google maps support, merely an anecdote of what did work for me that I hope might help you)
With Apple, I've submitted perhaps 5 corrections for 5 different (usually minor) problems in 5 years. Problems like a place claims to take Apple Pay when it doesn't. Or the actual place is across the street from where Maps claims it is.
In each case, Apple sends back a notification within 2-3 weeks saying they've fixed the problem, and when I've checked, it has always been resolved. Pretty happy with the service.
I've sent feedback and error reports about this repeatedly, and even had a friend that knows someone that works on Maps pass it on to them directly. It's never been fixed, and I've basically just given up on it at this point. It's really shown me how impossible it is to get any kind of support from Google for even an extremely obvious, straightforward issue.