What are my rights/remedies to dispute charges placed for collection for orthodontic care billed but not received?

Question Details:

The agreement with the orthodontist was that they would process the insurance claim and we would pay the balance due at $150/month. We made the payment but the orthodontist did not file the insurance claim within the requirements of the insurance plan which resulted in the insurance denying the claim. I have been trying to resolve this issue with the orthodontist for 2-3 years with no resolution. My son has not seen this orthodontist since I was made aware of the situation. My son did not receive the orthodontic care for which we were billed and it has now been placed for collection.

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