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No, you have no legal right to "refuse payment". You can sue and claim that they breached their contract by failing to verify insurance, etc. but you can't just refuse to pay since that can lead to charges for theft of services.
Also, usually at a medical care facility they have you sign papers stating that regardless of what the insurance company does you will pay the bill and that they aren't guaranteeing the insurance company will pay. If you signed that document it will be harder to win your case, of course.
You probably want to use a lawyer for this because they will certainly hire one and if they do have that paper then it is going to be an argument on contract interpretation and oral amendments, etc. which will require some legal knowledge and expertise. You can sue for your attorney's fees though.