Semano:
IF the billing is excessive, you should contact the utility/POCO to have the meter checked by them. Here in NJ, they have to do it, per the BPU rules.
I see from your profile, you did not state any reference to the electrical trade.
Are you saying that the 'wheel' within the electric meter (utility/poco owned) is "spinning"??
The procedure I would use is a clamp amprobe, and isolate the circuits, based on the meter reading. Then determine what is on the circuit. As sabrown said, with the 'main' off....you should have no load...zero amps on the hot legs.
I also would like to say that IF you have no electrical trade experience, you should not attempt to solve this, but hire a licensed professional.
