I had this call at 11:45am - 16/05/08, I missed the call so I didn't find out what the scam was they were trying to pull this time. I generally don't call numbers back that i don't know without looking them up first, and that's why I'm here.
A lot of people are saying they're hanging up before they can answer. I can only presume this is from the company calling, using a multi-dialer. the hang up after one of however many people they're calling, picks up the call.