INCOMPETENCY

I HAVE BEEN AN MTN CUSTOMER FOR MORE THAN 10 YEARS,AND I HAD/HAVE A CONTRACT WITH THEM THAT IVE BEEN TRYING TO CANCEL SINCE SEPTEMBER LAST YEAR WITH NO SUCCESS,THEY TOLD ME TO WRITE UP AN E MAIL TO RETENTIONS WHICH I IMMEDIATELY DID THEN THEY TOLD ME ITS AFTER CUT OFF I NEED TO CANCEL BEFORE THE 9TH THE FOLLOWING MONTH WHICH I DID AS WELL,WITH NO RESPONSE FROM THEM IN OCT IN NOVEMBER I CALLED AGAIN TO CANCEL MY CONTRACT ,WAS TOLD I NEED TO PAY THE OUTSTANDING INVOICE , THEY CANNOT CANCEL AN OUTSTANDING CONTRACT ,WHICH I DID AND CALLED AGAIN TO CANCEL MY CONTRACT ,THEN I WAS TOLD I NEED TO WRITE AN E MAIL TO RETENTION CANCELLING MY CONTRACT ,I DID EXACTLY THAT ,THEN CAME THEIR CUT OFF PERIOD WITH NO RESPONSE FROM MTN,IN DECEMBER I SPOKE TO A LADY AND ASSURED ME THAT THE CONTACT WAS CACELLED ,THEN AGAIN I GOT A CALL FROM MTN SAYING THAT THEY APOLOGISE FOR THE INCONVIENCE THEY GOING TO CREDIT MY ACCOUNT ,TO THIS DAY I STILL GET SMSES SAYING MY ACCOUNT IS OVER DUE .OF WHICH THE AIR TIME IS NOT COMING IN NOW ,STILL DONT UNDERSTAND WHY IM GETTING THESE SMS .IM REALLY TIRED OF MTN POOR SERVICE AND POOR NETWORK COVERAGE .