Well, if you go to the website and signup without reading the T&Cs (which most people do) you have been mislead on a key aspect of your purchasing decision. The webiste makes no mention of 3D being excluded (and thats not a minor point). In fact the website indicates its included by having a great big image with 3D in the middle. Eithically wrong, poor customer relations and maybe illegal - IANAL.
Yes. They claim by phone that the T&Cs haven't changed and always excluded 3D.
This is flat out untrue. I've provided the old T&Cs and they don't exclude 3D, and since I've not been informed of a change, those old terms still apply as far as I can see. Furthermore, the local cinemas only started charging last weekend, so its definitely a new charge. Again, ethically wrong, poor customer relations and possibly illegal - IANAL.