welcome to the site. I personally have not seen anything in writing regarding internet choices/charges, but I can tell you that I choose the best service available and have not been charged a single time. I have not traveled for six weeks, so something might have changed, so stay tuned and i will let you know how my choice of the best internet service this week works out for me.
We're 3 for 3 (no charge) so far on higher speed, with one time, like others above, my wife being told to select the higher speed. One thing I have observed over the years, which is running through this thread of comments; if at all possible (sometimes it's not), avoid asking, just politely move forward as if the better option is a given. Asking, often lead me to an ill-informed associate making up an answer which lead to a less favorable outcome or at least additional effort to secure the favorable outcome.