FNB Disconnect!

I've moved over to FNB because of ebucks and a host of other rewards but I've seen since that every year they have removed portions of the rewards to the extent that there a very few that remain. The latest is my FNB ADSL and 3G rewards which I've been told will no longer exist from November. When asked about it they simply told me that it's a business decision and that I will not be given an alternative to compensate me for what's being taken away from me. Surely they are in breach of contract?!