TELKOM line cancelled 6 months ago - still billing

We cancelled our phone line in November 2014 via e-mail as instructed by the Telkom agent in the Rosebank Telkom shop. We have since sent 5 more notifications, made several phone calls to the call centre, attempted to cancel online and yet no joy!<br> I have all documentation and proof of e-mails sent. As i received a phone call 3 weeks ago confirming that the line will be cancelled, I thought this arduous journey has come to an end. Yet, once again our bank account has been charged with another bill!! <br> I have no idea what to do next....<br> <br>