Best bet is to just tell them a reasonable reason why you can not help them. Like you don't do that kind of work, try calling the utility, etc..

Problem is I get ones that don't tell me their house is posessed until I show up. I don't charge if the problem is with the customer. I don't want them calling me every other day they think there's a problem.

One time we had a call like that. The older lady also kept saying how everyone would end up dieing in her house and it was haunted. Their was debre everywhere inside. It had cob webs all over just above her height of 5'. We agreed to look at the panel in the basement. When Lue was by the panel I slamed the door to the basement. Wiggling the door knob I said it's locked, she locked us in. Lue was ready to jump out the window.