If my eye doctor's office claims that I owe them money but my insurance company says they tried to file a double claim, what do I do?

Question Details: About 2 years ago, my optometrist started sending me bills for contacts that were 100% covered under my insurance. I contacted my insurance and they verified it was 100% covered and told me that they already fulfilled a claim and therefore were denying one hence why I was being charged. I called my optometrist and they talked to the insurance company as well and yet I still received bills and it's now in collections. I have only ever received one pair of contacts from them and they don't even correct my vision fully because I refused to go back for more services. What actions can I take since they optometrist continues to keep saying I owe them despite having 3 separate phone conversations with them about this and them not removing the debt?

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