Reward flight T&Cs

Unfortunately, I've had to cancel one of my reward bookings for next month. I did this a few weeks ago and have had to chase them for the return of miles which I finally received today. I have been refunded 75% of the miles used, but as yet no taxes and the email only confirms the refund of miles.
Am I correct in thinking that the taxes should also be refunded, I understand that this may be less an admin. fee but thought the T&Cs were slightly different for Au card holders and can't find info. on the VA specifically relating to a Au account.
If there's no money due back then it's not a big deal but if I'm entitled to it I know whose bank account I'd rather it be in.
Thanks
Jilly
Am I correct in thinking that the taxes should also be refunded, I understand that this may be less an admin. fee but thought the T&Cs were slightly different for Au card holders and can't find info. on the VA specifically relating to a Au account.
If there's no money due back then it's not a big deal but if I'm entitled to it I know whose bank account I'd rather it be in.
Thanks
Jilly