I had a similar issue with the colourist at my long-standing hairdressers (where I routinely pay £200+ every 8 weeks for full bleach, tone and cut).
Called before my appointment time to say I was stuck in traffic, apologised, might be ten minutes late, was that ok? Yes. Fine. Colourist hasn’t arrived at the salon yet (first appointment of the day).
Arrived 10 minutes late as expected, apologised again and was told it’s fine, no problem. He went to mix the bleach and I realised I’d left my phone in my car (in hands free cradle so was worried about it getting nicked while I was in the hairdressers for 3 hours). Asked receptionist “is it ok if I run to my car and grab my phone?”. Yes, he’ll be a while mixing the bleach.
Literally run to the car, gone about a minute, if that, and he cancelled my appointment. I waited nearly an hour the appointment before because he was running late but he couldn’t let me off for ten minutes?? First and only time I was ever late and I haven’t been back since…..