I think - it depends. At my salon, the employees park in the back and enter in through that door, so they wouldn't necessarily notice a promotional-sign at the front door.
Re the sign at their stations - again, if it's first thing in the morning and no one told them about this promotion before, I can understand them overlooking it. No, they shouldn't have been clueless when a customer inquired about it - but, for me, it wouldn't be an issue that I would either contact Corporate about, or discontinue going to that salon. A tote bag isn't that important to me, although I understand completely that others would disagree.