They did it to me, said they had printed 20k booklets with my ad in, they said I agreed months ago! Lol
I said "oh dear oh dear, what you gonna do with all them booklets!?" in a sarcastic voice, They could tell I wasn't buying it and hung up.
But my new one is this, when they say they spoke to you in March or whatever I say, "NO I NEVER" with absolute conviction, her "ermm yes you did sir" me "NO I NEVER!" again with absolute conviction, they start to feel stupid cus they no your on to them.
Or try "what you wearing" whilst breathing heavy