Balayage disaster

[NphysT]

Had my hair done, they messed it up, applied another toner on top and now I'm left with something completely different to what i asked for. Front is a lot lighter than the back. What can I do to fix this? Want to go a brownish/chocolaty colour, attached a pic of what it looks like at the front, back is darker.
Would applying a brown toner over the top help rectify the situation? If so any recommendations on which is best? Preferably not a permanent so if it goes horribly wrong it can be washed out. Thanks

[Disabrie22]

You have to make them fix it for you

[MidnightMeltdown]

Call the salon and ask them to fix it. I've done this twice with different hairdressers when I wasn't 100% happy. As long as you are polite they should be fine about it.

[NphysT]

The salon are claiming they have done exactly what I asked for and at the time were b*tching about me at the back so don't really want to go back there. I was also polite about it. Should add they charged me an extra £15 as well because of the other toner they applied. They'd just charge me it to be fixed and I don't want to spend more than I already have on this