Dominion Power They overcharged me for months on my Electric bill and when i called they told me they estimate the bills. Richmond Virginia

Dominion Power of Virginia has been overcharging me well over 3 years for electricity,I live in a module house that is not very big for years i have been call dominion power explaining to them my bill was way to high each and every time they tell me the same thing such as,we don't check the meters we estimate the bills are that everyone else is complaining about their bills. My bills were running around 300 to 350 they have went up another 200 or so and i can't figure out why they have been overcharging me for a long time and something needs to be done they should not be cheating hard working people.