http://www.hoaxcall.com/flatrate_103_a.html
my phone number was even listed as having been called in the last 21 days and would not let me recall it.
i called our office and that prank call was definitely it. the voice was the same and the interactions possible are the same. all thats left now is finding the person who did it and pranking them my way: i.e. asterisk autoredialer for 24 hours.