Vodacom, the worst service provider in Africa

I recently upgraded my cellphone. The upgrade charge, raised the day before the collection was R2800.00 odd. As this was done via a call centre there should be ZERO upgrade fee. The call has been open for over a week, the visit to the Midrand offices, where the Vodacom clerk agreed that the raised inc\voice was incorrect was a week ago. YET!!!! the account still shows the invoice. Any number of reference numbers are SMS'd to me and now the same reference number has been advised as closed two days in a row. As we close in on the end of June and the next collection run, are they expecting to collect. How is it possible that an invoice can be raised, which is an incorrect invoice, actually get through the system and cause phones to be cut off. I call FOUL, especially considering the timing, the call to the call centre and the request for Frauf department to contact me, does not even get a refernece number. Vodacom call centre agents protect everyone and we get no where. Vodacom is the worst service provider in this country.