Double process wrong toner...can I tone over it again without damage

Hey everyone. I desperately need advice or at least empathy as my hair journey was cruelly reversed by some twisted turn of fate just when things were looking up. If you have any similar stories or experiences to share please do!

Pastel blue hair is my end goal and I started with dark brown virgin hair. Because I am a sloppy and incredibly uncoordinated person I had my hair bleached out to white at a salon over the course of the past two months. It looked good. Then I lost my job and grew roots. This chain of events leads us today, when I walked into a hair academy salon an icy platinum blonde and walked out with yellowish, much more natural looking hair.There must have been a miscommunication as I was in just to get my roots done and the rest of my hair was obviously ashy and practically white. Now I'll have to wait on dyeing it blue (yay so excited) until I can tone out the yellow. I'm fairly pissed as my hair looks only slightly less orange than after the first bleach out I did so I'm freaking out wondering if I'll ever get my white back. I have no idea what product they used and if it was deposit only or had a developer added. It was only in my hair for maybe 5-7 minutes. Regardless I am alarmed as my hair stains so easily and I'm not ready to go the soccer mom honey blonde hair route.

I have some wella t18 and 20 vol developer as well as some purple toning shampoo. Should I tone it gradually with the shampoo or use the wella t18 to help lift it a bit back to white? The bleaching and blow drying have left my hair a little crispy so I'm not sure if adding more chemicals into it is a good idea.