Terrible dental insurance. Im insured by them thro...

Terrible dental insurance. Im insured by them through work. They denied my claim on a crown I need because they paid a claim to my prior dentist who never rendered the service. Now after they investigate and requested a refund they send me a letter directing me to find a new dentist. I find a new dentist and they denied my claim. Apparently until the dentist who got paid for the work that was never done sends them a refund they won't approve my claim. Its been 1 year and a half and im still back and forth trying to get my crown approved. Each time that I call them they act as if I havent explained the situation a million times keep me on the phone about an hour just to say they will respond when its resolved. Its so ridiculous trash insurance only reason I have them is because my job pays for it