Best one we got on the landline was from 'Gavin at BT'.
My wife immediately gave me the look and put it on speaker phone.
On comes 'Gavin' to tell us they have noticed our BB speed is quite slow and he is ringing to help us speed it up. He then proceeds to ask various questions regarding where we live, do we watch films all the time, do we pay by DD or on a monthly package etc.
To each question my wife replies, "You seem to have all our details in front of you so why do you need to ask for them again?"
To which 'Gavi' asks a different question and so it goes on.
After about 15 minutes, and I have to admit to admiring 'Gavin' a little for his perseverance, my wife asks him what branch is he ringing from to which he replies with the answer of our local town, (we live in the countryside). So she then asks him what street the office is in. He replies he's not sure because his mate brings him in each day. Then she asked things like the name of his supervisor, (he's not sure because he has never met him), how long has he worked there, (oh, ages. Maybe even as long as 12 months). All the while he is trying to steer the conversation back until he finally gets exasperated and says if he doesn't help to speed up our internet he may lose his job. Thats when my wife drops the bombshell.
"Well Gavin, just to let you know that you are not actually speaking to Mrs XXXX. My name is YYYY, (some fictitious name), and I am a police detective at (name of local town), and whilst we have been talking some of my colleagues have been tracing your call and should be knocking on your door in about 5 seconds."
And then the line abruptly went dead!
I wonder if Gavin suddenly went for a fag break and never returned.