Go into the electric utility office and request an audit of the meter.
They do malfunction, and if pressured , they should replace the meter.
As for any over-payment, you are on your own. Go to the top, or the media, if necessary.
We had a gas meter go berserk, Cengas refused to admit the meter was bad, but replaced the meter anyway.
Privately, we were told by a tech that the meter was registering 3x actual usage, but to help us would put his job in jeopardy.
We went to all electricity within a month. This was in 1980. Look how much they lost!