Records of the comms from that day
Denuncian que un avión de Aerolíneas estuvo muy cerca de chocar en el aire
I would say that is pretty clear that the ARG has messed up....
He is complaining initially that he is too high and cannot slow down/descent at the same time
ATC says "you only descended 1000ft in 3 minutes"
ATC give vector hdg 1 south, then headig 70
After a while the ARG reports "Iberia on final in sight, can we follow him?"
ATC answer "the traffic is your 10 o'clock, 7 miles, if this is the traffic, follow him"
ARG says "turning"
after a while ATC "the traffic is yours 1 o'clock, 3 miles"
ARG "in sight on the TCAS"
Iberia then complains
ARG "turning left" then... "i was following ATC instruction sir"
again on heading 70 (in the meanwhile you can hear a masterwarning)
then on the end the ATC tries to clarify "i believe you were referring to the EZY instead of the IBE"
as the ARG says "we told you that we had the "Iberia on final" insight and to follow him... you never said that we had another traffic on the right side..."