Shockingly BAD service

Our internet line has been down for a week now. We phone Telkom about three times a day and every time they go through the same processes even though we tell them that it did not work the time before. Every time they say they will escalate it and a technician will be sent out. And every time we phone back the next person says that there is no call for a technician to come out. We have been unable to do business for a week. What else must we do to get the service they promise us???