Sensing a pattern

I am working with some people -- a team of people, actually -- and that team expressed a very strong desire to have weekly conference calls with me. I've had 4 calls scheduled with them (maybe 5?). The closest they've been to on time is 15 minutes late; the latest they've been is 45 minutes. Once they were a complete no-show, with no notification at all, only an apology when I emailed to say "what gives?" Our call today is supposed to be at 10:00 AM. It is 10:31 AM now. No call yet.