I usually recommend diatomaceous earth but if it isn't working you will have to be a bit more brutal.
I lived in a rental house which seemed to have a selection of all the bugs available, including 'things in cupboards'. In the end I used a flea spray in the kitchen units. I emptied everything out and put it in another room, threw away anything dry or in a packet because they live in paper and card as well as flours and powders, and cleaned them, when dry I gave a spray of Frontline or Acclaim and shut the door of each one as soon as I had sprayed. Left them shut overnight, with the kitchen door closed, then open all day and night with the kitchen door closed.
Keep pets out of the room, especially small furries and fish, or anything that is not a cat or dog really and even then it is best not to expose them if you can help it.
You need to store foods in plastic bags inside containers with tightly fitting tops, no packets. If you don't want to throw it all out and don't mind using it, then put it in the freezer to kill the mites.
I am assuming you have weevils - tiny speck like creatures, although there are other things that live in grain and dried beans and pulses but they are bigger and beetly or moths.
Keep using the DE in cracks as it will reduce them if they are still there. It is not an instant fix but I can understand you not wanting to wait for it to work.