Originally Posted by
geraldtan
Was booking a SIN-MEL return using the SGMAST1 promo code (10% off regular fares, woo hoo!), and thankfully I checked the regular price, because guess what, I would have paid $250 MORE for the promo fare!!! I guess they aren't kidding when they say
Special Fares for Mastercard..

Screenshot: $2678 regular fare, $2912 Special Mastercard promotional fare
You don't show what type of fare each books into. On just about all airlines promo codes generally aren't lower then "saver" type fares. The problem is the website has been told by you to search for fares that qualify for the promo. The other fare doesn't and thus it didn't get shown.