What to do about a "bait and switch" regarding a cruise?

Question Details: Booked a cruise 2 months ago. Enticed via long term benefit of 50% discount on land tours. Less than 60 days after I made deposit, cruise line put out press release that they were cancelling the 50% discount. We complained via a cruise line forum that those of us under deposit prior to the notification that the discount would be terminated should be grandfathered in. The president responded on the forum that, "things change" and the line reserved the right to make changes to prices. Aside from the ethics, is that the disclaimer does not preclude them from engaging in what I view as a bait and switch action.

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