People who don't respond to emails/messages.
Last week, I signed up for a Pilates class at a local community centre and made an appointment to see the instructor for an initial private consultation on Tuesday.
I realised after I'd hung up that I hadn't asked how much it cost, so I called the next day and left a message on his mobile (the number that I used to make the initial appointment) asking for the cost.
He never called back, so the next day (over 24 hours later), I called his landline number for him that was on the community centre website. It turned out to be the main number of the community centre, and the guy I spoke to said he was teaching a class and that I should call his mobile number. (On the community centre website it says to contact the instructors directly for information about classes.)
The next day I sent him an email saying that I need to know how much money to bring and he still hasn't responded.
I can see if he is busy during the week but he has had several weekdays plus all Saturday to get in touch with me.
DH said that if he were me he wouldn't go because he wouldn't want to deal with someone that inconsiderate, and that I should find another class to go to, but I already made an appointment to see him Tuesday evening and I want to go to the class. I suppose I will just go there, see if he shows up, and if not, go home.