Here in NC we have an infestation of them too. Our Ag Dept. says they are kudzu beetles. They stink like stinkbugs but they have a hard shell and are a little smaller. The farmers are using highly toxic chemical sprays to kill them. I know for a fact, they will destroy your beans planted in your garden. They wait until the bean sets and then they chew through the stem right at the bean pod. Disgusting little critters!
As far as the Chinese ladybugs, we have them too. They really invade your house. We were told that after the first year, we wouldn't see them again for 7 years. Yea, right!! We have them 12 months out of the year, 'specially if the winter's not harsh. When the ground starts warming up, they swarm. It's awful. There's no way to keep them out.