What can I do about claims that never make it to my health insurance provider?

June 30, 2015, My wife gave birth to my first son. She had her own insurance at the time and I was able to add them(wife and son) to mine(out of state insurance) as secondary for the dates of service. Claims were never sent to my insurance, so January 2016 I called the hospital and requested the EoB and Claims be sent. I have been calling the hospital and insurance company weekly/bi-weekly to see if claims have been received and/or accepted. Every single time I am told by the insurance company that they have not received any claims for my wife or son. This last time I called the insurance company I spoke to a woman, she told me no claims have been received. She called the hospital on my behalf to see if claims were sent out and she found out that the claims were DENIED. She said that was impossible because those claims were never received in the first place! I need help please! What should I do at this point? I think someone is lying!