Cancelled my account and still getting billed.

On the 27th of February I cancelled my Telkom Line and payed my outstanding bill the same day.<br> Received an sms from telkom stating that they are saddened by my decision to cancel.<br> <br> Today is the 28th of April and I have been told I owe R1019.31<br> Obviously i'm not going to pay for this, I don't live there anymore. And how else do you cancel your line, because saying \Hi I would like to cancel my line"doesn't mean what I think it means."""