Claim rejected on doctor on network

I have been going to a doctor that on network for over two years now. And recently I want to the doctor and I was told the last claim for last month was not paid for so now I need to pay the doctor. I have made arrangements to pay but what embarrassing is to getting notify that a claim has been rejected and on the doctor I have been using for two years. I am sick and because I have no cash because I am paying for a medical insurance that won't help me when I need them the most I have to go to a clinic. I really hope I have time to change from bonitas because I am not happy.