Another picture.

That looks like slug, or snail, damage to me.
Cold caffienated coffee sprayed on the leaves can help, shallow containers of stale beer (or yeast mixed in water) placed in the soil can also help. Sharp edged material, egg shells, Diamotaceous Earth, in pretty large quantities, might also help. Encouraging predators of slugs, toads, snakes, birds, to hang around can reduce populations as well.
Slugs, and snails, need a cool, moist environment to live in so eliminating any place, rocks, boards, mulches where those conditions are can also help.

Have you seen any telltale slime trails on the soil or plants? Caterpillars could also be a culprit ; there are several kinds which may be found in the dark with a flashlight while you're looking for slugs!