Try this:
https://support.google.com/gmm/answer/6194894?hl=en
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Your directions were wrong
At this time, you can’t report wrong turns from your phone or tablet, but you can report them on your computer.
Open Google Maps on your computer.
Click Directions directions button image.
Enter the starting point and destination for the route for which your directions were wrong.
In the bottom right of the map, click Report a problem.
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I'm working on getting a human contact involved.
