Cancelled from Aug 2014 but still being billed

I phoned Vodacom in August 2013 to cancel a laptop/3G card contract that I had taken out 2 years prior. I was duly informed that I still had 12 months remaining on my contract (being a 36 month contract) and that I could only cancel from August 2014.<br> <br> I kindly asked the call center agent to load/capture the cancellation for Aug 2014 on the system (seeing that there is no \maximum notice period") which they said they did. Alas"