Yeah, that's not the way I read it.
1. "
To be eligible for the bonus Status Credits promotion, you must activate this offer online between 12.01am AEST 31 March 2016 until 11.59pm AEST 14 April 2016 inclusive". Done.
2.
You must ensure that you have activated the offer prior to travel to receive double Status Credits.
Also done. Note it says prior to travel, not prior to booking. There's no ambiguity here.
3.
During the Promotion Period you must also book an eligible flight and enter your Velocity membership number, which must match the number identified in this communication. Yup, also done. It quite clearly says here you must book an eligible flight - which I did. It was a different flight to the one that hasn't been given credits, but nothing in this statement says it has to be done for every flight, or that flights to be applied the extra credits have to be booked during the period.
4.
Eligible flights are flights for travel between 1 April 2016 and 30 June 2016 inclusive, that are marketed and operated by Virgin Australia and booked in a fare class that is eligible for Status Credits accrual Also meets this criteria. The flights were traveled on between 1/4 and 30/6 - 17/4 and 25/4.
There is nothing whatsoever in this promotion that implies that existing bookings are not eligible to be covered under the offer. Had that been the case, I'd have left booking my MEL-OOL flight until closer to the date - as it now appears that meeting won't go ahead.
I think the T&Cs are quite clear, and existing bookings should have been awarded the extra SCs.