Re: incorrect map data. what do I do? who should I contact?

Google chooses the source of data for you, and may change it whenever
they please.

That's the nice way of saying you get no choice, unless you wish to
serve your own map tiles instead.

Contact the company that has the bad data:

http://update.navteq.com/ or
http://www.geographic.com/teleatlas/teleatlassupport/index.cfm?action=contact

-Ian