Cancelation of vodacom data contract

I got a call from vodacom on the 14th of October reminding me that my contract is ending. The guy said he is renewing my contract should I change my mind I'll be able to cancel it within 14 days. On the 17th of October (after 3 days), I called the vodacom customer care to cancel the contract renewal. The guy helped me and said I would receive an email within 48 hours. I've never received any email. This month (November) the data has been loaded to my phone. I don't want anything to do with vodacom anymore. Please help me