Bad and POOR service

I cannot begin to describe the poor or lack of service i have been experiencing from the call centre agents. I have been calling to report cut off electricity for my grandmothers house. It is the only house without electricity, it has been three weeks and every agent tells me the same story each time i call. The technicians are always reported to have been at the house but to date none has gone. even as i type i just got off the call with the agent to be told the same story! Three weeks full no help! What must be done now?