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Ooh, answer removed??
I anticipated my post would divide. But what we all can agree on is that cold calling is a nuisance. Yes, we can sympathise with those who take call centre job's out of necessity or desperation but there are a high percentage of calls being received that are hoaxes, designed to get as much personal information as possible.
My gut feeling is that my caller was a hoax caller. Either that or totally unsuitable for his job, not representing his "company" well at all. Either way, I am content with my actions.