Vodacom messes up my billing again

My issue was not resolved as per my previous hello Peter posT with vodacom:<br> <br> I officially cancelled my cell contract with vodacom on the 1st December 2014. Due to incompetence on vodacoms behalf it was not done and I realised this on the 12 January 2015 when I inserted the card into a phone to use the prepaid number.<br> <br> I called vodacom on the 12 Jan 2014 yet again and they said it will be converted to prepaid with immediate effect and any charges will be reversed accordingly.<br> <br> Yesterday (3rd Feb 2015) instead of reversing charges they charge me an exorbitant R1364 debited from my account for \data charges"and subscription again. I have never used any data"