Non-renewal of contract - conversion to prepaid

Emailed Vodacom in August of my intention to cancel the contract and revert to prepaid on expiry date (11 Nov 2015). A month later= no record of email then told migration would only take place on 30 Nov bcos they can't change anything in the middle of the month so it will take effect in the same manner as the monthly \recharge"(i.e. midnight on the last day of the month). Started the process again"