I've been around long enough to know that, as well as, a few well places complaints to prove positive, not that I will in this case because I don't really care.
It's more of an annoyance that in B&M, mistakes like this are usually met with some result where the customer gets something out of it. It used to be this way online as well. In the last...4 years? online sites have decided they don't have to play by those rules because of the ease of fleecing without so much as a notification as in this case. Granted this case there is no money involved, unlike others where they either cancel / refund.
Either way, my previous post was more sarcasm than truth.