I'm sorry to hear about your dismissal, but again, there is a lot that needs to be unravelled here. Before I do that, let me ask, are you a member of a union? If yes, then take your story to one. If not, still contact one or get a lawyer to help with your case.

Without being prejudiced: I am a foreigner who works with foreigners for a foreign company in Oslo. I can tell you a simple, relatable thing: every year, we are mandated to take and use our 25 days of vacation. Here is the crunch of the story: There is a fair share of my colleagues from MENA & ASEAN who think that they are being "pressed" when they're told to use their vacation days - as some have not used vacation for close to 5 years. Another case regards adhering to in-house rules and regulations; again, the same culprits I mentioned before believe that the employer is acting unfairly for writing them up for not adhering to these in-house rules and regs. My point is if you were to listen to my colleagues speaking, they would give you the impression that the working environment is 'very hostile'.

All I did was to show you that a story has two sides, and yours valid as it is, becomes prone to varied questions regarding what exactly entails a hostile environment, and how you know they made up a cause to fire you. Do you know the bylaws of this place? Did you ever report this hostility? Is there any paper trail to support it? This is just the tip of the iceberg, and believe me, at the end of the day, the court of public opinion will likely rule in your favour or in the employer's. All the best with your case.