Agents in Canada generally do not rebate fares - I remember them doing so 5+ years ago when commissions were even higher. But after commissions got capped to US$100 or CAD$140 for a round-trip - they (understandably) have to reluctant to rebate. I don't know if RTW commissions are capped as well - but even then they would need the money from RTW to cover losses elsewhere. More than half of registered agents in Canada are now charging a booking fee (generally $10/ticket) on top of the ticket price.