I have a friend who is a hairdresser come and do my hair - have done for many years now - shes always done a good job - she now does both my parents and 6 of my friends plus hubby and daughter - shes fab and doesnt charge as much as the shops!!!!
If I had mine done at a hairdressers shop and they had cocked it up I would bloody tell em there and then - you are paying for something and if its wrong etc then you should complain!