After reading many of the posts, I think I will adopt the policy of at least texting the day before the appointment requesting a confirmation. I guess the escort will at some point be able to at least text an answer. If I do not hear then I am not sure if I will simply try again the next day (the appointment day) or assume that it is a "no go." As there was an attempt at confirmation, I will not regret not appearing.
In this situation where it has been more than one time (and I have allowed the situation to repeat) I would probably make sure I make a note of it in the Forum. I can't write a review obviously but there is nothing to stop me from noting the circumstances as they occurred.