I was denied boarding from this flight, they said I had the wrong covid-19 test even though I had a negative test taken within 72 hours of the flight as stated. I have contacted customer service multiple times to try to get a refund or at least the reason I was denied boarding in documentation so I can submit it to my travel insurance company, but cannot get a response back, except one stating that the reason I was denied boarding was that I showed the test on my phone, which I know to be false because I saw plenty of people do the same thing and be denied boarding and there is no policy on their website on what kind of test to take or that it can't be shown on a phone. I lost a business opportunity and hundreds of euros in accommodation and travel expenses in Spain. I will never fly this airline again, even if I have to take layovers to avoid it, and I hope after continuing to reach out, one day they'll have the decency to give me a legitimate reason for being denied boarding.