Have you tried logging into your booking at BA.com? I'm going from memory here, but I'm pretty sure I had to allocate it on the BA website (I think the booking reference is the same??? Otherwise there should be two booking references available from Qantas.com).
Are you booked on the BA code? Not sure if this matters, but I always have been on the BA code and not the QF.
Are you booked on the BA code? Not sure if this matters, but I always have been on the BA code and not the QF.