What to do about reimbursements billed to you by your own insurance company years after the fact?

Question Details:

My old health insurance company has sent me a bill for claims they paid between 3-5 years ago. They claim my insurance was lapsed at the time. My main complaint is that I have no way to show if this was true or not. I also had dual insurance at the time through my wife's insurance and feel that the opportunity to deny these claims was back then, not 3 years later. I also do not know who to contact to complain.

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