I ‘m at a loss as to how the…

Equifax Canada has notified 600 Canadian citizens that their credit
files were illegally accessed. Most of those affected reside in British
Columbia. The breach was reportedly due to “improper use of the access
codes and passwords of one of Equifax ‘s customers.”
http://news.com.com/2102-1029_3-5750434.html?tag=st.util.print

Now… Lets re-read that last line.

The breach was reportedly due to “improper use of the access
codes and passwords of ONE (1) of Equifax ‘s customers.”

Now what the hell?! The explanation given accounts for ONE (1) credit card number being comprimised, whats the story on the other 599?!