The issue remains.. What are your damages?

Was it good service? No.
Was it pleasant? No.
Was the waiter rude? Possibly.

But you are missing the very basic principle of law. For it to be a criminal offense, a crime must have occured. What was the crime?

For civil suits, you must have damages. Having your feelings hurt or be embarrassed in public does not qualify. You can't sue Internet Brands for embarrassing yourself with your posts here.

Other than a bruised ego, you have no damages

ETA:

The letter your PA wrote is offensive. "Migrant worker", while maybe accurate, is certainly not a way to describe an employee and get the GM to support you. Couple that with the description of yourself "mid-40s, settled, investor, boardmember (university lecturer & book author too)", it only confirms my initial assessment of you.

You are getting no sympathy here and I don't think ANYBODY who reads this thread will cancel their hotel stay in Spitsbergen because of your experience.