In 50 years of customer service, I've only had to do this 4 or 5 times, but here's how I did it. "Mr/Mrs Client, I'm sorry but I don't think I can satisfy you, and I recommend you look for another." Sometimes they're taken aback, but for me it was the simplest, easiest to back away from customers you would rather not deal with. You take the blame on yourself rather than placing it on them.
Mike Kurta
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