Next time ask how much do they have.

Then tell them they don't have enough in their bank or something.
I don't answer my landline anymore, waiting to hear a recording. No id on it.
I just look at my iPhone and caller's number. Only answer ones in my contact list or rarely if I remember a number not worthy for my contact list. Then I check for a message.
The state has yet to call that I am the winner of the jackpot.