Here are two pages of links to (mostly government) sites in Canada and the USA were you can report phone scams, or learn more about them.

Look here first:
http://800notes.com/arts/I2neMkbUAAo/where-to-report-phone-crime

If the reporting site you wanted is not in the above list, try this one:
http://phonehelp.2truth.com/complaint_sites_rev.html