Discovery refusing payment after authorisation

I am so disappointed with Discovery I dont even want to give them 1 star. I had to go for a MRI last year and I made sure I got authorization which I have proof of before going to Fourways Life to get it done. After the MRI Discovery all of a sudden says they not paying for the MRI, after they gave me authorization, now Fourways Life is threatening me with lawyers, which has forced me to pay the amount plus a additional R2000 lawyers fee. Im sorry but this is unacceptable, Im almost FULLY integrated with Discovery and now im seriously considering cancelling everything with them.

I Phone and phone and no one is capable of helping. Really disgusting customer service.