I agree. This is complete trivia, and the mistake is definitely one of those simply to chalk up to experience. We have all made them. I can hardly believe that the OP is even pursuing the thought of this. Jetstar had no reason to do anything for the OP outside the rules, and yet has already gone above and beyond by extending a goodwill gesture. What other airlines might or might not do in a similar situation is irrelevant if Jetstar doesn't promise the same thing.

And as for the complaint that "Jetstar must put in a toll free number that works for me in Canada because I choose not to have a mobile phone or any form of computer so I can't use Skype", I suspect that it would provide the high-ups (and possibly everyone else) in the Qantas Group a great deal of mirthful entertainment.