Am I Being Scammed By The Receptionist At My Dentist's Office? If Not What's The Best Course Of Action?

I had some dental work done in February, in-network, and was told it would be ~$800 and that my insurance would cover 75%. I even asked them to call my insurance company to confirm, and they said they did. I paid ~$200 at the time of the appointment and haven't thought about it since.
Yesterday I got a very poorly typed email sent from an iPhone demanding I pay the balance (just under $600), saying my insurance covered none of it, and that if I didn't pay in two days I'd be referred to collections. I called the office and reached the woman who had sent me the email, and I asked for more information (a statement, correspondence with my insurance company, a case number, anything). She ended up printing and scanning/emailing the original statement from 3 months ago. I emailed back asking for the insurance information correspondence or a case number; she said she can't give that to me and I need to ask my insurance company for it, and she reiterated that I'm about to be referred to collections if I don't pay immediately.
This very much feels like a scam, but on the chance that it's legitimate and she's just the worst customer service person in the world, I don't want to end up in collections for medical debt. To be clear, I'm not trying to get out of paying what I owe. If I owe anything, I know I'm ultimately responsible. I really just want to understand
A) Is this legit?
B) What did they ask my insurance for, and why was the request was denied?
I'm curious what my rights are regarding the insurance correspondence. Do they have to share that with me or can they just tell me that my insurance refused to pay and demand I settle the balance? And in the interest of getting a few days to understand what's going on, what rights do I have for late payment given that I was just notified yesterday? I'm not trying to stall or avoid payment, I just want to make sure this isn't a scam before I pay.
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