Billed after contact cancellation

I recently cancelled one of my Vodacom contacts, it was cancelled on the 23rd of April. The lady at Vodacom Menlyn informed me that there would still be an invoice payable for May on the cancelled contract. I asked her how much it would be and paid that as an extra amount, it was indicted on the cancellation documents after payment was made. For June my account was debited by Vodacom for more than I would have paid if I kept both contacts, more than a month after my contact was cancelled. I spent over two hours today being transferred from one department to the next and telling my story from one consultant to the next and one supervisor or team leader to the next. On numerous occasions my call would simply just be dropped while waiting for the next person in an authoritative position to answer my very frustrated and disappointed queries. <br> <br> One consultant informed me that it was an error and that the admin or accounts department would contact me regarding this issue, I was informed that a refund was due to me but that I must wait up to 48 hours for someone to respond to the service call or the querie that was logged and thereafter I should wait a further 7 days for payment.