Auth Number given but claims declined!!!

My son was injured and needed treatment. Before going to the Orthopedic Surgeon, I called discovery and was given an Authorization Number which is valid for 30 days. The treatment was done on the 19th and 27th of December. Discovery has rejected the claims and wants a PMA report. When I called the call center, i spoke to Dominque and he advised it was an error on Discovery's side, he will request the casualty report and resolve this within 3 days. Nothing was done, I then escalated the matter to Keenan who is the Team Leader and again 2 weeks later and nothing is done. I have been emailing Keenan, Dominque and Siviwe and no one bothers to reply to my emails. My bills are still unpaid. Is anyone competent enough at Discovery to resolve this?