Lots of complaints. helpful to tease them out.

1) The line moved slowly before you were called. Such is life
2) There was an issue with your documentation and the computer system that took a long time to sort out and you missed your flight. That sucks.

But Norwegian did nothing wrong here. You chose to fly on a budget carrier with infrequent service. Norwegian didn't control the Finnish border crossing. If you wanted flexibility on a ticket, don't fly Norwegian. Flexibility costs money. (Not that any other airline would be on the hook either.)