Sunnova energy Misleading infomation Nationwide

I was told by the sales rep that the 18 panels on my home would wipe out my electric bill from Edison, it never has.  I get a true up bill every year, this past year it was $1400.  I have contacted them on numerous occasions only to be told that they system is operating properly and there is nothing they can do as I am under contract. I have a letter from the sales rep stating that based on his design I should not have a Edison bill.  Sunnova doesn’t care about their customers, only the bottom line.  I have requested additional panels to be installed even though my bill with them would change, they won’t do that unless I sign a new 25 year lease??? Why would I do that when I am already unhappy.  I want these panels off of my house or I want additional panels installed, and to make an adjustment to my contract.  I will not sign another contract with them as they cant fulfill the promises already made to me.  My average Edison bill was $165 a month, now I am spending over $250 a month