Salutations ReikoX,
Please receive the expression of my genuine sympathy!
It happens i once had them even in my refrigeratorā¦ No joy there, the only thing that i could afford to do in my remote location of the far-side country, formerly between a few mountains (ā¦), was to lower temperature while trying to figure out what to do next - which was NOT to spray using neem oil as The Borg was able to adapt anyway: they mutated and then i had a sample of neem-resistant parasites! Plus a tiny amount of nuggets, eventually, which i was never able to vaporize because of the taste!!
Other than a cold environment i had to give the plants some last-resort mechanical treatment: a water shower which targeted both the mothers and eggs located under the leaves, where they remain until itās far too late, hence my desire to find some easier and more systematic prevention method. Not to mention these insects can enter a ādiapauseā state which lowers their metabolism and hence reduces their sensitivity to chemical warfareā¦ But i was a newbie dealing with spidermites and still found no satisfying/convincing retaliation plan.
I wish you luck with that but this is bad news, may your session rest in peace! Resistance is practically futile.
http://oi61.tinypic.com/2ikuow0.jpg
Māwell maybe itās not too late to have a change of mind and try to grow seeds insteadā¦ 
Or maybe iām just over-reacting since i was traumatized!
http://oi47.tinypic.com/2ev7w8x.jpg
ā¦and a couple plants tooā¦
YMMV.
Good day, have fun!! 