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Frankly- post it here and send the link to Garnier. They should know that whatever they promise on their packages is seen by many people who also have to take their decisions when they stand in front of the shelf in the supermarket.
Plus there are websites in which people judge the quality of products- and they are checked out by all the companies these days.
I'm a little suprised they recommended an ash based tone. One week before my sister's wedding, she dyed her hair "ash blond". The ash tones turned her hair LIME GREEN! You can imagine how thrilled a young bride was with that. I took her to my stylist who specializes in color correction. Bonnie makes a ton of money off people who dye their own hair! She told my sis that ash tones are the ones she has to correct most often! It took a couple hours, but she fixed sis' hair the same day and she was a beautiful bride.
Personally, I'd stop all the at home stuff. Find a stylist who is trained in coloring and color correction and get it fixed professionally. I dye my hair alot, but I've never done it myself since I saw my sister's hair!
Or, as a last resort, go to one of those beauty schools in the link I posted. Phone and ask if they can help.