I am considering filing a complaint as well.
Did you tape the calls? I have a denied claim currently and I am kicking myself for not taping abuse.
Have you requested a full and complete copy of your claim file?
Anytime an Insurer is requesting info from your doctor and opting to pay for it usually means they are looking for rehab options or trying to get your dr. to say you can go back to work.
Make an appt. with your Doctor just to get the documents sent out.
Also ask them to only contact you via email.