Any contract where the other party performs so little seeking of my agreement (none at all really) that no representative talks to me in person or even electronically in an individual capacity, where no one witnesses me put my mark on the paper or hears by verbal assent, is in fact no contract at all. Despite what the courts may say. Should they say otherwise, they're wholly illegitimate.
That any of you have let something else stand as the norm is bizarre and alarming. Contracts require explicit, sought agreement, by their very definition. Nothing can be implied. If their business model relies on implicit agreement because anything else would be too difficult, then they simply shouldn't be allowed to remain in business.