Very disappointing experience at Carlton Hair Waterstone Village Somerset West

Visited the salon this past Saturday, during my consultation discussing the colour to be done on my hair, the stylist and I seem to have had a misunderstanding about the colour I wanted and what she wanted to do on my hair. We eventually agreed upon the colour to be done a dark ash blonde with highlights (staying away from warm tones). I noticed when I got home and the last couple of days that the colour isn't true to what I asked for. My hair is now brown and the highlights are yellow. I doubted the colour in the salon already but was not wearing my glasses so hesitant to say anything in the moment but now my suspicion have been confirmed. Especially as I'm using Carlton products on my hair that's supposed to prevent brassy tones. Seeing as I paid a premium price this is a very disappointing experience and especially so as the hairdresser at the branch in Waterstone Village named Mignon who did my hair is suppose to be a colour expert. I am very disappointed 😞