Aw, that's no fun! I gave them ALL of the information they requested on TWO different credit cards - completely made-up numbers, of course. I had to go find the cards (tick, tick), read the numbers very slowly (tick,tick), read them back when they came up 'invalid', but changing one number (tick, tick), etc., etc. The HEAVILY MidEastern-accented man finally asked if I was playing a game with him and I said: "Of course - I do this with EVERYONE who violates the National DoNotCall Registry." 12 minutes of his time wasted while keeping him away from someone who might actually fall for their scam. Then he hung up before I even got to ask how his Mother and the goats were - mighty rude ...