Getting Discovery to pay

Why do we have this endless fight with Discovery Health to pay up on accounts for which have been given authorization numbers, codes etc before a procedure has been done. Why do I keep getting emails from Lake Smith + Partners, Jackpersaad saying Discovery has not paid AFTER emails from Discovery have been sent to me before the procedure saying they will cover it? I am fighting breast cancer - I don't have the energy to fight Discovery over and over again. I followed the right procedure according to you and never went ahead with anything until you had said all was in place! JUST do the RIGHT thing DISCOVRY!!