How much is too much for a color?

I got a balayage in the beginning of summer that I never liked. I decided to dye it back brown yesterday. I would of done it myself but wanted the color to match my natural hair. Anyways I went and spent $75 not including tip on getting like 3 shades too dark of a color, a rushed job that some parts I did myself that she should of done (small stuff), then when tip came I was calculating it and thought I did the math wrong so she took the calculator and told me 18% was base so I paid her $13 dollars when I was just gonna do 10% but after she did that I felt awkward, especially cuz she’s friends with my good friend and she was “talking” w my brother and it didn’t end well so I was iffy having her do my hair in the first place. Anyways not the point. Was $75 too much or good price?