Same as everyone else. Called. No mess.
On the other hand, some of you sure waste a lot of time and mental energy whining about these people. Don't get it. Everyone I know I have in the Contact List. When I get a call like this that doesn't show as a known contact, I ignore it, sometimes check it here, but then create a new contact called JUNK so I never deal with it again. What the heck is wrong with you people that you feel like the world will end if you don't answer? If its important, they'll leave a message.