The contract ended 14 September 2015

I called vodacom on the 8th of August to give notice notifying them that I will not be renewing my contract. The agent offered me an option for a WIFI and I told her to call me back on the following Monday, when she called I told her, I do not want WIFI, I want the notice to be formalise. She told me to switch off my galaxy tab on the 30th of September so that Vodacom can migrate my number to prepaid. I switched off my phone. To my surprise-a deduction of R405 went through, thanks to fnb, I got the amount reversed, considering they never refunded me the last time I had wrongly paid on my old contract. All I want is for Vodacom to migrate this number to prepaid and to stop debiting my account for a contract that ended already. I want to keep my number...I hope you dont mess up, and cancel my line and give it to someone else like it happened on the old contract.