I searched on Iberia Pluspoints website and the way to retro-claim was shown as sending an email atcliente.es
AT mail.europcar.com. However this email address doesn't work.
I've now found the Europcar Iberia webpage, but I still can't find a way to make a retro-claim
https://partner.europcar.com/iberia/en/home/
Anyone here able to shed some light?