Sorry, I see that there are actually phone numbers listed when you investigate your link above. I couldn't find them when i needed them when travelling a few months ago.
I have found out the hard way, after much searching, that the only way to turn off Fido Roam so that you aren't charged for a whole day of roaming for sending One text is to call Fido on the phone and wait as long as it takes(long time) to talk with ...