MTN IS ROBBING ME SENSLESS

I POSTED THE FIRST REVIEW ON THE 21ST OF APRIL 2016. TWO WEEKS LATER, STILL NO REPLY! I HAVE BEEN STRUGGLING TO GET MY ACCOUNT SORTED FROM THE 6TH APRIL TILL TODAY 21ST APRIL. I'VE CALLED IN MORE THAN 6 TIMES AND EVEN GOT 6 DIFFERENCE REFERENCE NUMBERS. REF ***, ***, ***, ***, *** AND *** AND EVERYTIME I CALL TO DO A FOLLOW UP, THEY KEEP TELLING ME THAT THEY CAN'T FIND THOSE REFERENCES... ALL OF THEM. MY MTN ACCOUNT NUMBER A***, FOR ALMOST 2 YEARS NOW I HAVE BEEN BILLED R78-07 EXCL VAT FOR PROMO SERVICE FEE(HANDSET) AND NOW I AM BILLED A COLOSSAL R174-56 EXCL VAT. WHEN I CALL, NOBODY CAN TELL ME WHY AND MTN ARE SUCH BULLIES THAT WHEN I DON'T PAY THAT EXTRA, THEY SUSPEND MY LINE! AN EXTRA THEY CANNOT JUSTIFY. ONE CONSULTANT EVEN TOLD THAT IT'S FOR THE UPGRADE. WHAT UPGRADE ARE THEY TALKING ABOUT IN MARCH? ITS ONLY YESTERDAY 20TH APRIL THAT I DECIDED TO UPGRADE. THIS IS REALLY DISTASTEFUL. MY HUSBAND ONCE HAD A SIMILAR SITUATION WITH CELL C IS IT WAS RESOLVED IN LESS THAN 5 DAYS! I DEMAND TO KNOW WHY THE PROMO SERVICE FEE HAS SUDDENLY GONE DOUBLE OVER AND THIS IS NOT WHAT I AGREED ON WHY I TOOK OUT THE CONTRACT WITH YOU.