Hi Tom,
There's an overseas number you can try....this:
http://www.canadavisa.com/canada-immigration-discussion-board/index.php?action=post;quote=585226;topic=63158.0;num_replies=15;sesc=5b41127a5b265ccbff1fe95cd8bd6bb8
The call centre is only open Mon to Fri, 8 AM to 4 PM EST. The best time to call is around 8 AM. After that, it's gonna be very difficult....usually after 8 AM, I need around 8 to 10 tries (in a row) before getting on the queue line
. The automated message often says "sorry, we are unable to transfer your call" (because they're busy), but you should keep trying and you will eventually get on the waiting queue... =)