You're lucky you were not trying to reissue.
Beware that some QF and BA offices also charge a service charge of $50-75 (USD equivalent) for ticket reissues IN ADDITION to the ticket reissue price listed in the fare rules.
For example in HKG, QF and BA share the same office (either sides of the room)... QF waives the service fee for Gold/Platinum members, whereas BA charges every pax.