APPALLING SERVICE FROM MTN

I REQUESTED CANCELLATION OF ONE OF THE NUMBERS ON MY CELLFONE CONTRACT WITH MTN ON 20/04/2015. IT WAS NOT CANCELLED. 8 DAYS LATER I CALLED THE CALL CENTRE AGAIN RE THE CANCELLATION. I WAS TOLD IT WAS BEING ESCALATED. AGAIN NOTHING WAS DONE. I CALLED THE CONTACT CENTRE AGAIN ON 05/05/2015, AND WAS AGAIN ADVISED IT WAS BEING ESCALATED. STILL NOTHING DONE. MY FOURTH CALL TO THE CALL CENTRE WAS TODAY 08/05/2015 AND AGAIN WAS ADVISED IT WAS BEING ESCALATED. EACH TIME I CALL MTN (***) I AM PUT ON HOLD FOR APPROX 20MINS BEFORE A CONSULTANT COMES ON LINE. <br> HOW MANY MORE CALLS WILL IT TAKE BEFORE MY REQUEST IS PROCESSED AND THE NUMBER IS CANCELLED!!!