Who called from 3520006976

That's what I'd like to know.  This number keeps calling, and I can't find out any info!

on phone automated call for card services wanted creditcard info asked who i was talking to they hung up

I said hello twice, and they hung up

No company or person name shown.  Only phone number.  Why isn't the National Do Not Call registration doing its' job?  Can't something (anything) be done about all these unwanted calls?

I just also got a call a few moments ago from this number with "Name unavailable" displayed on my caller ID.  I'd like to know how they manage to get a 000 prefix...my guess is it's some kind of spoofing mechanism.