Landline Cancellation

I Cancelled my Telkom line on 19 August 2017 – I sent email to ********** with the cancellation form and my ID. Landline number ********** 065 I have since then received 2 further invoices. Each time I resend the email, but still the line is active and I am being billed. Please cancel the line and cancel the invoices and confirm this with me.