Sounds to me as if what you have been told already is fact if you're travelling on a non flexible ET ticket. You will only be able to claim back the taxes if you cancel, subject to paying the cancellation fee as well.
If you post the fare classes your itinerary has others will be able to give you a more accurate assessment.
As for the T&Cs if you go in to MMB and see if it gives you the option to change/cancel your booking and see what it says.
Last edited by HIDDY; Aug 29, 2008 at 6:56 pm