Vodacom call center useless and unhelpful

For 4 months I struggle to cancel my contract. Now that my contract is canceled, I need my settlement letter. After speaking to 18 different phone operators, I managed to requist my settlement letter. But now I already REQUESTED MY SETTLEMENT LETTER 4 TIMES BUT STILL HAVE NOT RECEIVED IT. THE WORST IS: I CAN'T CALL THEM ANY MORE " THEY SAY I HAVE RITCHED MY MONTHLY CALL TIMES TO SPEAK TO THEM......" I AM ONLY ALOUD TO CALL THEM NEXT MONTH AGAIN. How Pathetic is that!!!!!!