I'd wonder what the costs and risks are of trying to get that $170, assuming it's one or a tiny amount of passengers compared to dozens each sailing who tell their friends. If you get someone who's got nothing better to do than argue on the topic, make you prove that the charge is justified and not just some misconfigured device that "didn't go online because I only use it for reading ebooks, honest", then it could get ugly including legal or press routes.
On a small scale for a cruise liner scaled operation I'd be prepared to say "huh, that's odd" or turn a blind eye to just one.
On a small scale for a cruise liner scaled operation I'd be prepared to say "huh, that's odd" or turn a blind eye to just one.