Being billed on a cancelled line

n November 2019 I had requested a cancellation on my Telkom Home Line, I did the cancellation through the website as I was told this is the only way it can be done. The site said it was done. I now received a call from a Telkom rep saying that I have an outstanding amount of R2732.19. I have not received any statements since Dec 2019 from the email system hence that was an indication that it was cancelled. Now suddenly I'm told I have an outstanding amount and the system still shows my line as active. You will be able to see that I have not used the line since Dec 2019 because according to it the cancellation was done. Why is the line still active? This account should be 0 as I have not used the line since Nov 2019