Who called from +1 866-846-8803?

I received a message from an oriental female voice stating I owed a medical bill, which I do not. I called the number from my work phone, and it answers as Health Systems Original Policy. It sounds legitimate, I am on hold for the next available worker. The call was answered unprofessionally, and she appeared a little confused. She asked if she had called me, I said yes and gave her a false name. She said just a minute, and then returned and said she would call me back.