Okay, I would follow up.
Write to Spanish regulator, write to Iberia, write to IAG.

Include date of flight.
Focus on the cabin inspection.
Do not focus on the actions of the other passenger - but do focus on crew actions such that they relate to these.

Don't go to customers services, go to the safety managers if you can at Iberia.
With IAG, make it clear it is a safety concern again.