Haha yes I got this a few months ago when I was back in England. It was a good job my Mum didn't answer.
He was a right word removed aswell, and I told him as much. He was an Asian chap who kept saying "you are having problems with Mickelsoft, I need to help you".
I gave him about 30 seconds, literally saying "blah,blah,blah" before he told me to stop wasting his time, and he put the phone down.