I've been claiming Iberia Plus points for a HKG-TPE flight I took a few weeks ago, and Iberia is requesting the ticket number (a bit stupid, since it was a round trip and they have already credited the points for the TPE-HKG segment).

Anyway, I sent them a copy of the booking confirmation and highlighted its number (J2VXX), but they insist that they want the TICKET number. I e-mailed Cathay some days ago and still no reply. Is there an easier way to get it? Or is it printed on the confirmation, boarding passes, etc? I haven't been able to find it.

Thanks.