Vodacom contract ends - continue to be billed.

Very disappointed in Vodacom. Gave notice on my 2 year contract stating that I would no be renewing my cellphone contract as I opted to go prepaid and then rather have wifi installed at home. After going through the painful experience of calling their customer care line, I was reassured that my last debit order would be on the 1st of November. Needless to say, I have had a debit order from Vodacom on the 1st of December with the airtime I received from them monthly. This was not what I wanted at all instead! Will be heading to the bank to have them taken off to avoid yet another debit order from vodacom next month. Pity as I would have gone with them regarding WiFi but now that I've seem their ways, no thanks!