Cancelled line/ADSL but still being Billed

On the 27th September 2018 I have notice to cancel my Telkom landline and ADSL line and on the 10th October 2018 has received confirmation that my request has been resolved.

I know I needed to give 30 days notice which is why I paid my bill at the end of September and October.

However I now get a bill in November which shouldnt be the case as the line is cancelled.