Having a bad treatment at the hairdresser's really pulls you down, you have my sympathy, and so annoying when they won't listen. They always think they know best!
I have had the same hairdresser for 28 years now, she has become like an old friend. But she gets bored with my current style and likes to change it Last time she used a noticeably darker dye, I commented as soon as I saw my wet hair in the mirror, but she was unabashed. Everyone at home and work either told me they hated it or I got the silent stare treatment, so I know it is not a good look, and I hate it each time I catch sight of myself in the mirror. I will have to live with it for six weeks until I can afford another visit, when I will ask her to put it back to the old colour.
In the grand scheme of things it is nothing but a minor, temporary annoyance, but I will be so glad to get rid of it!