Cancellation of contract not honoured

My 24 month contract term ended in August 2015. I cancelled the contract as per the agreement in August. The transfer to prepaid was scheduled for the 1st of September.<br> <br> On the 1st of September I realised that I was still on contract because new bundles were loaded. I contacted customer care on the same day. They responded saying that Vodacom experience technical difficulties with the transfer of customers to prepaid accounts. My transfer would be scheduled ASAP. I would not be billed for another month.<br> <br> No feedback by 4 September.<br> <br> I contacted customer care again. I received the same response, this time stating that the transfer to prepaid will be scheduled with high priority, i.e. within 48 hours. Again they stated that I will not be billed for another month.<br> <br> I am still not on prepaid. I have received a bill for September.