Okay, so about a week ago I got my hair done and asked for it a light brown. It looked good at the hairdressers, but when I returned home it was this ashy blonde colour. It looked terrible so I went to a hair salon and bought some toner, it made my hair go a red/orange colour so I dyed it blue black. I washed it today after about 2/3 other washes, and patches of my hair have faded and the blonde is coming through.

If I want to go a dark brown/black how do I do this?
And after all this, how do I get it healthy again?!