DISCOVERY REFUSAL TO PAY FULL AMOUNT

I had to have eye surgery to remove cataracts from my right eye. I went to an eye specialist in Edenvale as he was contracted in to Discovery . .All expenses were paid by Discovery. But the day of surgery there was a anesthetist who had to assist . But to my horror Discovery do not want to cover all his expenses. SO NOW MY QUESTION IS DO WE AS MEMBERS HAVE TO KEEP A RECORD OF ALL DOCTORS WHO YOU AS DIXCOVERY DO NOT COVER OR GO THROUGH ANY FORM OF SURGERY WITH ANASTHETIC MUST WE CANCEL AND JUST GO BLIND AND THEY DISCOVERY DID NOT EVEN CONTACT ME TO INFORM ME THAT THEY WILL ONLY COVER A SMALLEST OF PORTIONS FOR THE USE OF THE ASSISTANT. VERY DISSATISFIED AS THIS IS NOT THE FIRST SUCH TRAP THAT I HAVE FALLEN INTO BUT THEY DISCOVERY WILL ALWAYS EXPECT FULL MONTHLY CONTRIBUTIONS AND INCREASE EVERY YEAR FOR WHAT SO THEY CAN BUILD GRAT OFFICES IN THE MIDDLE OF SANDTON .