Steve81, quoting laws misses the point for two reasons. First, legal meanings of terms are different from ordinary meanings, which is why there are legal dictionaries in addition to normal ones. And second, the simple fact is, you and everyone else knows absolutely that lying is commonplace in advertisements, and those doing the advertising keep lying, which obviously means that whatever legal mumbo jumbo verbiage there is in the law, they can lie in the real world and get away with it. Quoting laws does not change that obvious fact.
I already gave you an example, which you have ignored in your responses: Many advertisements are made claiming that something is free, when, in fact, one must pay to get it. Every literate speaker of English knows that "free" means:
"Given or available without charge."
https://en.oxforddictionaries.com/definition/free
But when one sees an advertisement that an item is "free," one usually knows that that is just a complete and total lie, that one must give them money to get the item in question. Almost always, when an advertisement says that something is free, it is
NOT free. This is so common, that to make a big deal of it gets people to react dismissively, saying that, of course, it means that you get two things for the normal price of one of them. Even though the word "free" means no such thing. (If you are not a native speaker of English, look it up; there is a link above.)
It is a complete and total lie in advertising, and it is done all of the time, with the companies getting into no trouble at all for it. That is the real world, regardless of what laws you choose to quote. Lying in advertising is commonly done with no problems for those doing the lying.
So when an ISP lies to you in an advertisement, they may very well get away with it, without any courts ruling against them, and without any problems for them at all. You can pretend that the law prevents lying in advertising, but that is just pretend.