Disappointed with Vodacom

Yet again Vodacom Fails to Deliver, I've been getting billed by Vodacom for an account that was supposed to have been cancelled however despite numerous calls to them, nothing has changed, my last interact with their consultants was about a month ago where I was assured that everything was going to be sorted out, only to get an sms this morning saying that an immediate payment is due today. I need someone to call me today! I need this resolved now. Sanvir ********** 233