I'm baffled by this as Bitstamp aren't widely known to pull these kind of bullshit manoeuvres but there have been complaints about this sort of thing with people who are from places like Slovakia, what country are you from?
Perhaps they should ask no questions, then customer coins can get stolen and the Bitstamp bank account can get seized - and we can all complain we got gox'd.
My 30 day volume is measured in millions. I withdraw all the time and have never been asked any questions.