The "Do Not Call" list is only intended to stop legitimate marketers, who maintain records that they routinely check against the list. It does nothing to prevent unscrupulous callers who randomly dial numbers, hoping for a lead or victim.
I got a call from this same number. Do not call these numbers back. There are scams going on that involve 1-2 rings then the caller hangs up. When you call the number back, they are able to somehow attach charges to your number. Always remember.. if its important and/or legit.. they will either call back or leave a voice mail.