Claim back

I have struggled with Discovery for 2 months now. I submitted a claim on the 5th of August and still waiting for pay out. I call almost everyday to follow up, When i call there is ALWAYS something new that they want me to send. I then have to resubmit my invoice for the claim, this goes on and on as I have to resubmit over and over. Why not tell me after the first mail that so and so is needed for the claim. But no its a stalling technique this. After every time i submit the same invoice over and over something else is always needed. I am passed angry, upset, i am fuming and so irritated with Discovery. They are quick to take our monthly installment but when it comes to pay out then there is always a 100 excuses. From the minute i sent the invoice for claim back i have had problems. Two months of not getting anywhere, phone calls and emails over and over, wow I am so done! And then each person that speak to me have a different story, no I REALLY don't understand that. This is the worst experience i have ever had with a medical aid service. Shocking!