A quick update as I now have the full 90000 Avios (previously only credited 81000).
I raised a ticket for the missing 9000 some weeks ago, got an acknowledgement then silence.
On Wednesday, I messaged the Twitter team, was asked for my ticket numbers (again !) and last night 9000 Avios appeared along with an apologetic email.
So I am very pleased with the Iberia Twitter team and feel like I have now got excellent value out of this promotion...