That's highway robbery. Contact you city counsel and county supervisor.
Organize your neighbors.
Don't let this go.
My highest bill for one month was $320 last winter and I had 2 electric heaters going 24/7/

Did they tell you about your 350% increase?
That is regulated by the city and county and increases have to be approved.

20% increase would make headlines
There is something wrong.
Raise bloody hell Lori.