Bill more than doubled!

I have medical aid and the hospital transported my daughter to a state hospital, we were told that an ambulance would be R1100, I told them I had medical aid and my medical aid has ambulance services, they contacted the medical aid and then proceeded to transfer my daughter. I then end up receiving an ambulance bill not for R1100 but for R2,626.63. I contact the medical aid and they advised that the Hospital never submitted a claim. How did this become my problem?