What sight do i go to to get the wrong directions changed to the right one its wrong on map quest, on gps etc.

I cant get from my house to work with my gps. If I follow the directions I end up 12 miles north on a different street. Im in northern calif. and the name of the street is old oregon trail. it use to go from mexico to oregon. Over the years it probably has been changed many times. The business that I am trying to reach has been in this same location for 20 years. This side of the street we are in the city the other side of the street is in the county and gps maps are right. Can you help me get this corrected with a web sight or a phone number or any direction you can send me that might set me on the right road.

on a tom tom gps system if that is what you have go back to the home page and tap in re start erase what you now have in there and punch in the address you want. real simple my six year old set my tom tom up.