Caller: I am calling from XXX agency regarding a publication for the XXX organisation. I understand..
Me: Our advertising budget is zero.
Caller: For a minimal sum of $500 per ann..
Me: Did you take O level Mathematics? Do you understand the concept of zero?
Caller: Per annum, it is...
Me: No? No Mathematics?
Caller: What other publications do you advertis..
Me: It does not matter. Zero. Do you understand how much zero is?
Caller: Thank you..
She just would not give up.