Request for thorough testing of faulty phone line

I requested Telkom to test my line and they discovered a fault on the line. A few days later I received an SMS informing me that the line had been tested again and that there was no fault found. Nevertheless the line is unaudible [ both parties on the line cannot hear each other clearly and the line is \noisy".] I submitted a further request for a technician to come out and test the line [Point to Point]. In response to this request I received an SMS informing me that a Technician could arrive - and the message further mentioned that this technician could arrive in a non-Telkom [unmarked] Vehicle but that he would produce ID to validate himself as a contract worker. Would Some one be home? Yes etc etc Nothing has happened to date. """