Disappointed to the core

I called Vodacom to find out when my phone contract was expiring, I was informed June, but I could only put in notice to terminate in June, so it would be terminated in July only. I was cool with it, I called to cancel in June, called again to confirm if it was disconnected, to which they confirmed it was cancelled! To my shock, yesterday they have debited me for the same contract which was supposed to have been disconnected, to which they can't explain why it's still active - no one could explain why it was still active. I asked to talk to the supervisor and she assured me she'd call me at 8am, when the contracts department was open a conference call would be made, to which I agreed coz I DEMAND ANSWERS, I WANT ANSWERS! I got to the office, reshuffled my staff meeting for 9am to accommodate the conference call. At 9.18am, I received two missed calls from an unknown number (I can only assume it's them), however, this is an hour and 18 mins later. It's 10am and I STILL HAVE no answers from them - I am utterly disgusted by this network. They seem to ALWAYS find a way to let me down, doesn't matter what it is, they will simply disappoint every opportune moment. I DEMAND ANSWERS.