Slightly bumping the topic, but here's some examples on my end. Shortened down, but you'll get the jist.
"Good afternoon, you are through to James. How can i help"
"Hello, i need a new boiler"
"Ok, this is Tax Credits and we don't do boilers".
"I was told by British Gas that you do"
By now, i'm trying not to laugh
"So to clarify sir, you were told by British Gas who specialise in Boilers and Gas to call Tax Credits for a Boiler"
"Yes"
"I'll let you think about that, thanks for your call"