No contact for installation - call centre hopeless

Got my LTE router delivered, technicians supposed to set up external antanna within a few days. I have had no contact from anyone since delivery (29/09) and been pushed from department to department within Telkom, each time with long waits. I have been told to contact Sales Direct, but it is impossible to get through to them, just rings and rings and then cuts off. This installation is part of the contract, and if not done, this will be breach of contract. Please assist urgently.