Urgent help needed!

Hello, so long story short, I am on holiday in Spain (from Belgium) and about 500km before we reached our destination my car ( 2019 508) my car gave a engine fault regarding emissions. Turns out there is something wrong with the ad blue system, car says that starting won't be possible after 700 km. So now here I am, in Spain, with a car that won't make it back to belgium. Wtf do I do? Do I have it fixed here, where they will for sure take advantage of the fact that I am a tourist. Wtf do I do. I'm at my wits end...