Used to have a co-worker; his girlfriend would call every day.
Me: "IT, how may I help you?"
Her: "Benny."
Me: "Hold on, I'll get him for you"
I got sick of just hearing "Benny" blurted at me on the phone, so I started playing stupid.
Me: "IT, how may I help you?"
Her: "Benny."
Me: "Sorry, I am not Benny." [silence for 10-15 seconds]
Her: "Is Benny there?"
Me: "Yes." [silence for 10-15 seconds]
Her: "Well, can I speak with him?"
Me: "I don't know, that's between the two of you." [silence for 10-15 seconds]
Her: "May I please speak with Benny?"
Me: "Sure, hold the line for just a moment and I will get him for you."
I only had to do this 3 or 4 more times before she became much more polite on the phone.