LINE CANCELLED BUT STILL BEING BILLED

I cancelled my Telkom line on 14 February 2015, cancellation reference is ***A<br> <br> And yet today I received a bill for the month of March 2015, saying I owe R612.<br> <br> How on earth can you a bill a customer after a service is cancelled, and the line has been disconnected?<br> <br> Get your act together Telkom, this is pathetic. I want this bill reversed ASAP.