Managed to get through to Emirates on the phone after about an hour on the UK number, takes about 30 attempts, then you wait to music. They looked it up and said that some refunds are processed separately and if we haven't received any within 21 days of first applying call back and they will help. Both ours are listed as processing though we have one a few days ago and no sign of the other.

I asked about seat bookings and she checked and (we booked these separately as they failed to go through first time) and she said you can do one form (seemed unsure if 1 per passenger but its not one per seat) and put all the EMD numbers in - ours were different to flight ticket numbers. EMD numbers start 176. You click add field - I have added them all on one with all the numbers in, I paid in 3 transactions so 3 different numbers so 6 fields. I needed to open up the PDF document which came with each seat booking to get these numbers. I have entered all the seat numbers and INVOL refund etc in comments. Hope it works.