HESA DOES NOT RESPOND AT ALL

I DID AN ACCESS COURSE AT UNISA AND SENIOR CERTIFICATE GOT ENDORSED WITH EXEMPTION BY HESA. BUT I DID NOT GET MY CERTIFICATE AND I HAVE SENT SEVERAL EMAIL, CALLED HESA COUNTLESS TIME, THEY DONT ANSWER EMAIL OR PHONE CALL. THE PHONE RINGS CONTINUOUSLY UNANSWERED. I HAVE BEEN TRYING FOR A ALMOST A YEAR NOW, I DONT GET AN ANSWER FROM THEM.