Hair help again!

Hey guys.. So i went to the hairdresser two days ago, to get my hair gray... I guess the hairdresser didn't really know what she was doing, and it just turned out yellowish blonde.. Which I hate!
I went home very sad, and looked for online solutions.. i heard that if I toned my hair with a purple toner - to make it white, and then dyed the hair gray, would work...
So that's what I did and it just did not work.. The hair is now slightly ligther but still looks really bad.. 
Now Im getting told to dye it a ash blonde/light brown colour - to turn it gray..? i'm so confused!
My hair doesn't really seem damage, because i used 9 of bleach.. And thats probably why is not going gray too xD 
I don't know what to do.. i need advice..

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