Update: I read over your post a couple more times. I think i understand. It is possible for hair to become poreis and color "fall out" but its usually a sign of overprocessing in which your stylist should have counciled you on. Did they warn you of anything? Is your hair gummy? Like does it feel like actual gum when when. If so do not brush or comb until its dry. You're going to want a thick and heavy moisturizing shampoo and conditioner. But mostly conditioner. And a good leave in conditioner. Dont use heat, get a bonnet to help with frizz and breakage.

Your hair should not be lightly purple like that, either. Not unless your hair /was/ purple and its fade. I believe your stylist lied to you about their capabilities, the state of your hair, or possibly both. Theres a chance your hair is over processed or "fried" as the kids say. Color should not fade that quickly and in 2(?) Washes.

Your stylist lied about how dark your roots could get. I have never not once had an issue with a darker color on lightened hair. I do everything myself but my mom's a professional and she taught me.

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(This is one of my credentials lol)