Where are you seeing this occur? On the Bing Maps consumer site? (http://bing.com/maps) Then report this through the feedback link in the bottom left corner of that site.
In the Bing Maps development API? If in the API provide information to reproduce this. i.e. is it a location on the map or information in the geocoder?
Or in Facebook? If it is in Facebook then try using their help functionality. Note that they use their own point of interest data set and are the one's who likely have the incorrect information and not Bing.
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