Lighter roots and removal of color

I have naturally med/dark brown hair. I went to a stylist to have my hair lightened to a deep red/mahogany color. Unfortunetely the roots took a light red ugly color and the rest pretty much what I wanted. I think my hair looks ridiculous and want all the color out. I have read a bit on this board about Uncolor and Effasol. I am deathly afraid of bleach due to a hair horror about 5 years ago. Can anyone tell me more specifics about the products above. I don't want to damage my hair at all since it is finally growing. My hair is naturally curly and very delicate. Thank you in advance for any responses.