Clean out every bit of grain products in your cupboards, and toss them out. When you get new flour, cereal, etc. keep them in the freezer or in glass containers with tight lids. That is the only way to get rid of them. If there is anything left in your cupboard that has any of the weevils in it, they will not go away until you have gotten rid of it. I have even had them get into plastic containers with what I thought were tight lids, so that is not a solution. Sometimes you get them already in a something from the grocery store, so when you get new cereals, put them in the freezer.
I have also had them get into cans of paprika and ground peppers in the cupboard, so don't overlook those things. I also keep those in the refrigerator now. They will get into tea bags, and will also eat holes in plastic storage bags.