Healthy care cash back

After sending several emails making various calls and many promises from Discovery Vitality to get back to me with feedback I have to date not received any feedback on why my Healthy care cash back for April that should have been allocated as per the sms received on 09/04/2016 is still not reflecting. I have several reference numbers and I am unsure as to which one to quote. I am extremely disgusted with the lack of service and being totally ignored when trying to solve a query through the correct channels.