"Classroom calendars." An advertising business in QLD. Don't deal with them. They call from a private number and try to trick you into advertising with them. If you aren't interested they won't leave you alone. I don't answer "private" numbers thanks to these guys.
Also a note of reference, "fair trade" doesn't go out of state (it just sticks to yours.) So if you're not in QLD (where this business is)fair trade won't help. So just hang up. Any business calling from a private number is an obvious warning sign.