Cancelled line but still charges

<p>In March i went to chatsworth telkom office to cancel line. I understood that it takes 30 days so was willing to pay for final invoice a month after. I received an sms in April to confirm cancellation but in May received bill for May and June. I have tried several times calling customer services but they for ever lasting offline (not offline to charge though). Please rectify and send final invoice so i can pay. I am not willing to pay anything extra as i did cancel the line and its obvious that someone has cancelled only adsl part. </p>