Cancellation of Landline Service

On 27 November 2017 I requested for my landine to be cancelled through the web platform and l received an automated response informing me of the request being submitted. But knowing that there is gross incompetence at Telkom l sent through a form requesting for the landline to be cancelled. But the surprising fact is that l owe you money for a service that l have requested for cancellation. Therefore my question is why am l being billed for a service that l got confirmation for it being submitted for cancellation.