Not that hard, just keep your claim clear and succinct:
- On DD/MM/YY I registered for the Qantas Double Status Credits promotion - see registration email attached
- On DD/MM/YY (within DSC promo booking window) I booked CNS-BNE-MEL as part of PNR XXYYZZ departing DD/MM/YY - see original eticket attached
- On 26/08/23 my booking was involuntarily changed by Qantas to a direct CNS-MEL flight - ideally attach a copy of the change email, if you have one
- I have since flown and received 38 status credits for this direct flight - see boarding pass attached
- I wish to request an original routing credit of 28 status credits for CNS-BNE and 28 status credits for BNE-MEL for the flights as originally booked
- I would also like to request an additional 28 + 28 status credits per the terms of the Double Status Credits promotion.
If you lodge this via email with all the docs, wait a week, and then call the FF team and quote the SR number, I would wager money the SC are posted on the spot.
I've done this several times and never had an issue - there's a lot of scaremongering on AFF around ORC/DSC situations, but 99% of agents can handle this if your message is clear and you provide every piece of documentation. If you happen to get a dud agent who wants to argue it, just HUACA.