Contract active without my knowledge after cancellation.

I just found out that Vodacom has been deducting money, R212, of my account since 2017 and I have cancelled this number ages ago! I was never told with any of my other dealings with customer care that this number even existed! I have phoned cancellations and the lady promised me that I will get feedback, and she requested a credit. I will await this to happen and if not will take further measures, as I have paid Vodacom for nothing for more than a year! Jennifer