Norwegian Cruise Line taking me to the wrong destination LOL

Booked a 12 day cruise on NCL Jade, from Cape Town on 21 December, 2021. One of the main reasons why we booked, was to see family on Christmas day in Richards Bay - we would dock for 2 day’s. Received email from Norwegian Cruise Line on 15 November, saying that we will no longer go to (or dock) in Richards Bay, as they wil now only go as far as Durban port. Very difficult to explain the problem to NCL agents, as they all have the generic answer …. You can cancel , with a $749 penalty. Cannot understand why I have to be penalised for a problem caused by NCL. This is like getting on a cruise to the wrong destination LOL. What a bummer.