Telkom Line not cancelled as requested online

Good day, I have canceled my Telkom Landline 24th of Nov 2018 . (I also made printscreens of everything - should you need to see it ) At that time I phoned in to cancel and the support desk gave me the steps to do it online - which I did. I even got a reference number : ********** 4. Now I see that Telkom is still billing me for the last 3 months (almost R600 ). I want Telkom to cancel my line with immediate effect and also reverse the charges. I will also write to mybroadband and other social media pages if I dont hear anything back before the 6th of February . Thank you