Zero response to call-out to repair telephone line

We logged a call on 28 July 2015 regarding our faulty telephone line. I have followed up numerous times with the fault tracking call centre and have been repeatedly promised that a technician will contact us to set up an appointment. It is now 11 August and NO-ONE from Telkom has contacted us to date. How can one escalate this further? The kind lady at the Call Centre says their job is to log the call - but the communication with the technical department has somehow broken down.<br> Who can I talk to out there???