I did a call like that in september, as I walk in the apartment the lady is going on and on about the other tenant stealing her power.
All the lights are on in her apartment, her A/C is running and she has electric dryer and electric hot water heater and was complaining her bill was 120 a month. Not to be rude i traced every circuit in the panel and shut her main off and checked everyything in the other apartment and all was good. She thought i was lying and was going to have someone else look at it.