electricity still of from wednesday

My electricty just went of on wednesday night after calling in a multitude of times were promise to come and check it when then arrive they struggle to switch it on and said the problem is inside the house after hiring a electrition to inspect the wirring he couldn't find fault by me so I inform ekurhuleni they sent people out to switch it on again without inspecting they say its fine emmediatly when they left it went of again even when you swtch of the main power in the house the power still trip in the sub station.