I had an issue with my own address on google maps (not as severe as this, it just had the wrong zipcode). After trying to correct it using the tools built in to maps 3 times and having my correction rejected every time, I tweeted my complaint @googlemaps, did a quick DM back and forth and it was fixed shortly thereafter.

(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)