Unauthorized deduction

I had a three-year contract with Vodacom, and the month before it ended. I called to cancel because I don't want it to continue as a month-to-month. February was supposed to be my last dedication. No this month in March I call in again to ask why they are still deducting from my bank account. The consultant who assits me claims that I didn't cancel I told him that I have proof on my phone that I called in January for cancellation. They refused to refund my money and they yo cell another contact on me as I told him that I don't want any contract with them. He said his manager was going to call me but he did not.

He said they will only stop in April and I said to him I didn't call to cancel I did that January already I call to ask why deducting money out of my account without my consent.

I ask him to transfer me to the billing or complaints department of which he refused to do so.