Check your bill . . . If you have an old analogue meter that requires reading by a meter reading contractor, and you were away, they might not have had access, or sometime meter readers just don't come around. Does it say on the bill if it is an actual reading bill, or an estimated reading ? Most analogue meters are the old dial type, but some are digital, they don't have the smart meter ability to send usage info daily to the power supplier, and then to your retailer (AGL), those need reading e ...