u/Dado223

So, I have little problem here. Don't know Swedish language so I need help about this letter. Short story: I worked in Sweden couple years ago (probably the best job I ever had) and I get this letter. Right now, I'm in a little bit stress because don't know should I pay something or it's maybe just a little panic attack? Can anyone please help me what is this about?

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Fellas, thanks for your answer! Love you Sweden!