Ok so I have a MONE4 through a TA in australia and issued by QF.

I want to change the routing and TA advises me only their own $10 fee plus the difference in taxes will be applicable.

However now TA advises me that QF also want me to pay the difference in fare, that has gone up since my original ticket was issued.

Is this correct? TA is still investigating as the fare rules don't state this. However they tell me that if QF don't budge, I'll have to pay the difference.

Any advise on this would be appreciated.

Cheers,
Jimmy