Regardless of what was behind her attitude, after a reception like that, was he actually required to stay there and perform any service? I know that if stuff like that happened back at the company and weren't corrected quickly, it would be grounds for "hostile workplace" complaints and lawsuits.

If I were in a situation like that, I think I would've said something like: "I'm from _____ Company. I was told you wanted your phone system worked on. We could work on it now, or come back sometime when it's more convenient for you, or just forget it. Which would you prefer?"