This may be helpful to some older IB account holders who have not seen their 90,000 points post. I never received my 34,000 points for the cancelled IB flight. The reason was that I had has no activity in my account for 3 years, as IB does not count Avios transfer from BA as activity. So, they consider the account inactive and when the refunded points hit the account they immediately disappeared. That was a frustrating lesson learned and another reason why i did not take place in the 90k promo.

Any Iberia callcenter should be able to cancel an award.
If you want to speak to Iberia Plus directly, the best way is their Spanish callcenter:
.+34 917 742 607‬

We never received any written confirmation of the cancellation. Agents gave us different answers every time when we asked how long it would take to get the Avios back (from 24 hours to 10 days!). When I called again 3 days after the cancellation, the unfriendly agent told me that everything had long been refunded. When I said that wasn’t the case and that we hadn’t even received an email, she put me on hold and when she came back, sure enough, the Avios were back in the account.

My impression is that regulär callcenter agents can cancel bookings, but that the refund process is handled by a different department. Only after they have issued the refund (which one should receive an email about), Iberia Plus can manually deposit the Avios back into the account, in case it didn’t happen automatically.