We went on a 4-day Blue Lagoon Cruise last December and there was something not at all right with the pricing. This was because they switch you to a 4-star ship if you book on the 5-star ship and there are too few bookings.
There was nothing wring with the cruise if you had paid 4-star prices, but we paid top dollar.
No refund of the difference. Basically, they said get lost.
Not happy - Blue Lagoon Cruises should fix this false advertising, but they have refused. It's not the money so much either, it's the principle of the thing. It should pay to be honest, and not pay to be deceptive.
I have written about it in detail here:
I would like others to make sure they DON'T go on the 4 day cruise at 5-star prices. If there is a switch, DON'T TAKE IT. Take the 7 days if you like - Fiji is lovely and the crew was great.
I don't know why they act like this. They try very hard to give you a good cruise, except they rip you off at the same time.