I want to know if I have a case against the auto body shop or I should cut my losses and move on.

I took my car to a body shop for an estimate. I did not authorize any work and I did not sign any paperwork. The insurance adjuster said my car was going to be totaled. I was then informed the body shop had done all the repairs to my car (except paint). Since the repairs were complete the insurance company will not total my car. I stated to the body shop that i did not authorize any work on my car and was told the adjuster authorized the work. The adjuster states he cannot authorize work. The estimate from the adjuster states the the insurance company cannot authorize work and that the customer has the right to have their car repaired at the body shop of their choice. My car is now full of fillers and apparently i am stuck with it. I would like to bring a small claims suit against the body shop for the cost of repairs that were never authorized.