Legal Question in Consumer Law in California

I am not sure what you mean damage waiver vaguely printed on the back. A damage waiver is what you purchase so you don't pay for the damage. I have rented from most of the major rental car companies over the past couple of years. Every time I rent a car I have to initial the contract and affirmatively decline the damage waiver.. Look at your contract closely it may have that... Your own car insurance may pay for the damage and many credit cards have that coverage... Without seeing the actual rental contract I am only guessing

You should call your insurance company and let them handle this. I also do not fully understand the question but knowing you damaged the car, this should be covered by your insurance.