Poor Service

I have been paying my bill every month, I don't even get an invoice posted. Yesterday when I arrived home from work my electricity was disconnected. Am I not supposed to be served with a notice before being cut off? Why was my electricity cut off without any awareness? I have called the customer centre four times now and I hold for more than 7 minutes without any agent assisting me. Now I have to throw away food because of this. Account No ***