Once they did that to me, said my computer was currently causing issues and they wanted to run a check and see. None of those callers are worth my time, but it could have been fun to call their bluff. Considering I have dialup the only way I could be verbally talking to them would be to have my computer disconnected.
I've had a couple of those some years back. Got so I'd taunt them by waiting for them to finish their spiel so I could tell them I'm a Linux user and not Microsoft. They'd hang up before I could.