Insurance law is very complicated. Proving that your insurance company treated your claim with bad faith usually involves careful investigation of the insurance policy, the paper trail and the relevant statutes. Without an attorney with plenty of experience handling insurance bad faith litigation, you are going to have a hard time proving even a seemingly open-and-shut case.
In an example of a case from outside of Arizona, the Texas Supreme Court has laid out five rules for insurance bad faith cases that involve a specific set of circumstances. In the underlying case, a homeowner successfully sued USAA Texas Lloyds for refusing to pay her claim following Hurricane Ike.