NO ASSISTANCE FOR THE SETTLEMENT T LETTER

THIS COMPANY CAN CALL YOU 5 TIMES A DAY TO COLLECT/ RECOVER OUTSTANDING PAYMENTS FOR THEIR CLIENTS. I MADE ARRANGEMENTS WITH THEM THEY SENT ME AN SMS WITH THE AMOUNT I HAD TO PAY TO SETTLE MY ACCOUNT WITH VODACOM. I HAVE PAID VODACOM AS PER THEIR SMS INSTRUCTION, I HAVE SENT THE PROOF OF PAYMENT AND WHEN I REQUEST A SETTLEMENT LETTER FROM THEM THEY ARE NOW TAKING ME FROM PILLAR TO POST. NO ONE CAN ASSIST ME WITH THE LETTER. I HAVE SENT THROUGH THE PROOF OF PAYMENTS VIA EMAIL, I HAVE CALLED THEIR CALL CENTRE AND EVEN WENT TO THEIR OFFICES IN RANDBURG AND NO ONE IS WILING TO ASSIST ME, YET THEY HARASS YOU WITH A 1000 PHONE CALLS A DAY. I HAVE PAID THE VODACOM ACCOUNT SO WHAT IS DIFFICULT FOR THEM TO JUST SEND ME THE SETTLEMENT LETTER?