Failing to Cancel services

I requested Telkom cancel my line effective from the 30th of September, as we are switching over to fiber, after I had paid at the end of August, however not only is my line still active, and my ADSL is still functional, Telkom wants another R900 from me.

I REQUESTED THAT TELKOM CANCEL MY LINE EFFECTIVE FROM THE 30TH OF SEPTEMBER , AND I WILL NOT MY PAYING TELKOM ANOTHER CENT.