It's not. Other popular european companies like Vodafone or Sky do the exact same thing. They tell you upfront that it will be X € for 12 months, and Y € starting with the 13th month. Unless you cancel.
I hate this as much as the next guy. However it's clearly stated in advance and if you miss it you haven't paid attention during sign up.
I hate this as much as the next guy. However it's clearly stated in advance and if you miss it you haven't paid attention during sign up.