what kind of "mite killer" did you use? for broad, cycalemen and russet mites you need a that is labeled for that specific pest - these mites are microscopic so your average contact killer does little to them and could even speed up the rate of reproduction
avid -
forbid - pylon are all labeled to kill broads - generally the best coarse of action would be to use each of those 1 time with an interval of 5-7 days - if you spray any of them more than once you risk making the mites resistant
you should first get a 60-100x scope and look at the affected leaves - broads and cyclamens are very similar looking while russets look like the end of a worm
then you have to remember that these sprays are carcinogens and not labeled for plants that are to be consumed and if you are going to use them you will need protective gear to spray them