I say go back to the salon too, my friend had her scalp burnt by the bleach they put in her hair last weekend and she went straight back (she hated the hair colour and cut too!). Even though it was our friend who coloured it! Don't be afraid to complain, you aren't putting people out by doing it, people do it all the time.
In the meantime washing up liquid used in place of shampoo will dull the colour down drastically (give it a good week or so to work) as it strips the colour out of your hair and lemon juice also (although you shouldn't use too much of this because it can also bleach your hair blonde).