ADSL problems over extended time

My ADSL line is down for more than a week, following months of intermittent faults where it failed up to 10 times a day. The fault was reported and responded to after almost 2 weeks. A technician diagnosed the problem as the POT filter, which was replaced, as was the router just in case. The problem remained and another fault call was logged. After 10 days a really dedicated technician arrived and replaced wiring, found the ADSL sync was at the wrong speed and had that corrected and informed me that repairs were being done in the exchange. The problem persisted, with frequent noises on the line. Another call was logged (after 2 attempts to do so, both cut off apparently by a Telkom technician working on the lines). Then the ADSL failed completely, and has now been out for a week. I tried to get the fault escalated via a Telkom customer service centre, to be told they were not allowed to handle fault calls! When I did get it escalated Telkom's response was to send an SMS saying they were busy and would attend to the fault when they could. Not good enough. I am trying to run my business, and would now like Telkom to fix this long standing problem quickly and permanently.