Do I owe someone an apology?

[No Vested Interest]

6. I agree with Okasha.

Just be affable, as though the phone conversation had not taken place.
Go about your business, take any emotionalism out of the transaction.
Thank him for coming, then for his work when completed.
Men, and all people for that matter, love to feel appreciated.

You'll never know how his wife conveyed the Facebook message. Even intonation makes a difference, as we all know.

Good luck with the pipes.