Mites sprayed with Sucra Shield are alive & well

[greenpassion]

I have a mite problem with one of my mini phals, which I have planted in a mix of moss & bark. I noticed a week or so ago that there are tiny little black or dark brown mites (lice) crawling thru the mix. I was advised to use Sucra Shield on them, as this product is supposed to get rid of them. I mixed as directed and sprayed the medium to the point of saturation. Well, so far, no good. Just now I pulled it out the pot in order to repot it into fresh mix, and there were dozens of them crawling around the bottom of the pot. I actually directly sprayed them with this product and they aren't fazed in the least. What to do???