Change the city the phone number is tied to

When we phone out, our location on people's caller ID shows us located in a different city and province than where we are actually located. This is becoming a problem as people are sensitive to possible scams and/or want to deal with local companies only. We have to explain that it's VOIP and when we signed up this was how the number was assigned but people are skeptical. Also, some won't answer our calls because they aren't local. There should be a way to change the number location to reflect where we actually are!