If Suave shampoo is available there get that. When i was trying to get rid of my semi-permanennt hair color for permanent my hair dresser said to use it. The cheap shampoos kill the color.
When my daughter dyed her hair black, and didn't like it, our hair dresser recommended washing it in Head and Shoulders to strip the colour, so you could try this.
Head and shoulders used to work when it was more of a medicated shampoo. However since it has "evolved" into more of an ordinary high street brand it doesn't work any more for removing colour.
Visit your hairdresser and see if she can recommend anything for stripping the colour