I don't know if you can get this stuff where you are but I really like SB Plant Invigorator (
S B Plant Invigorator). It is effective and non toxic so better for your plants and the general environment.
Also because it works by suffocation the mites cannot become resistant to it as can happen with a pesticide. I've used it to control spider mites in the past. The only downside is it needs to be applied for a few weeks as it has no effect on the eggs so the mites will come back if stopped too soon