I went here for my well woman check up. The care I...

I went here for my well woman check up. The care I received was fantastic, however they didn't bill my insurance and I was charged for something that was fully covered by my insurance. I took off work to talk to their billing department and provided them with my insurance information, because I had been unsuccessful in getting it taken care of over the phone. I also made a follow up call and was told that the matter was taken care of. A couple of days ago I pulled my credit and found that the charges had gone to collection. I'm wanting to buy a house soon, so I had no other option but to pay off the charges.