Vueling complaint: Travelling documents

My name is Yael Emma Marachlian Kusminsky. I travelled from Amsterdam to Málaga with Vueling on Tuesday 21st of December and it had a return ticket to Amsterdam. I didn’t take my passport with me and I asked if it was okay to travel just with my NIE from Spain. They said yes of course and they gave me my boarding pass. Again, I had a return flight and they could see that in their system. When I got to the airport in Málaga on Friday 7th of January to fly back they told me that I couldn’t travel with just NIE. I explained everything and they wouldn’t listen. I said I left my passport in the Netherlands and they didn’t care, it wasn’t their problem. Not only this is indeed their problem and responsibility for letting me travel with my NIE in the first place knowing that I had to return to the Netherlands, but also this is a case of discrimination because they said that if I had a Spanish ID (DNI) I could travel with no problem, but since I’m not Spanish I can’t, even though the NIE has the exact same information than the Spanish ID (DNI): a picture, an identification number, birth date, name, the only difference is that I’m not a Spanish citizen. I want you to reconsider this and think what message you are giving to the immigrants that live in Spain in 2022, that it’s valid to travel with a Spanish ID (DNI) but not with the NIE, the only difference being the nationality.