Discovery Health don't actually care

I have been a member of Discovery Health for many years and am now so over them I want to change medical aid. They say they are the cheapest and best in town. We'll I beg to differ..... At the end of July they took my premium off twice. When I requested the refund at the beginning of Aug I was told it would take "2-3 working days" to process. Three weeks later I still didn't have anything. How long is 2-3 days, actually. Finally the money came thru to be told "refunds are only processed at the end of the month". Clearly a lie was told to KEEP THE CUSTOMER HAPPY. We'll blow me down it's happened again this month. My 2-3 days was told to me last week and still nothing. My point being it's high time matters like this were dealt with professionally. After all if we don't pay our premiums our medical aid is cut immediately. CLEARLY DISCOVERY COULDN'T GIVE TWO HOOTS ABOUT THEIR CUSTOMERS. Does anybody have any advice going forward