Bad service

I had a contract with telkom since 2017 Nov for 24 months. I called them in December 2019 and notified them that I would like to cancel. the Lady explained that the last debit order would be in Jan 2020 and explained why. I called back again after a promo lady was offering me to extend my contract told me that the cancellation request was not sent through. I called and when I explained that the guy confirmed that the cancellation was indeed not sent through I told him to follow up because my last payment with telkom is in Jan 2020 and I am not expecting to go on for longer than that. Today I get a statement saying that I will be debited on the 29th of Feb 2020. This doesn't make sense and I no longer want to do business with them since they are ***********.