Charged after notifying of Cancellation of Account

I called the cancellations department over 6 weeks before terminating my wife's Vodacom number and porting it to MTN. I asked the consultant when my contract would end and was told the 11th of May and that after that I would be on PAYG. ON the 11th the phone went onto PAYG and i assumed all was well until I see that I have been charged for the whole month of May. This is dishonest of Vodacom as they were notified well in advance of my intention to cancel my contract.<br> <br> When I phoned the cancellations dept today I was assisted by a useless individual who hung up on me after I asked to speak to his supervisor. I want my bank account credited for the month of May as I had told Vodacom that I was cancelling. I was not informed that I would be charged for a whole months subscription after the 11th of May.