We frequently get support calls raised with us by the end user rather than the companies 'technical' team. They're always a bit miffed when you ask them what they've done to fix it themselves. Explaining they're going to get a bill if we come and unplug then plug back in a phone generally makes them try themselves. Never get a thanks from them.
One customer refused point blank to pay for our time once, having taken a server down themselves which was working to try to fix another issue. The person who had done it was on holiday and when they got back freely admitted it was them.. Nice bill for the time taken arguing with them as well.
Biting the hand that feeds IT
