The site context model information is imported directly from OpenStreetMap. We ourselves are not able to correct any incorrect streets, buildings, or missing information.
However, OpenStreetMap allows anyone to contribute to their project and actively welcomes notes about improvements from local users. You can simply find the incorrect area on the OpenStreetMap, and use the menu on the right side of the screen to leave a note, stating which data needs to be changed:
You do not need to be registered as a user to do this, as anyone can edit the map.