Read the terms and conditions. Actually don't. It's page after page of a mixture of feel-good and CYA obfuscation for something that can be put into two simple sentences: "We can do anything at any time for any reason. You can do nothing and have no recourse against anything we do." Click accept to continue!
Oh yeah I wouldn't recommend anyone try this themselves, just find it hilarious that the bank fell for it and that it even held up in court. One of those things that could have only ever happened in that country, I suppose.
One benefit of a multi-year offline contract is that it often sets the prices and outlines when, where, and how these prices can change. Offering a bit more stability.