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As far as I am aware the voucher cannot be extended especially if this is from a cancelled flight. The validity if 12 months from the original flight.
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That is a shame as you can call Qantas Shop to make a booking and then post the voucher in to them.I had a Qantas voucher worth $100 a while back, they gave it to me after repeated late and cancelled flights. Trouble was I could not use it online and when I called they said I could use it at any Qantas Shop or sales desk.
Trouble was I live in Country NSW so I did not have access to these other than half way trough a trip so I never used it in the end.
Yes you are quite right.A cancelled flight voucher is current only for 12 months from the date of ticketing, not the date of the original flight.