There’s nothing in the verbiage that lets you fight off the insects in any way. Fireball it? There’s still locusts everywhere. Didn’t even thin out the cloud.

Maybe if a summoned swarm of insects had mass charm or mass suggestion cast on it to cause the insects to obey, I’d allow that although it clearly bends the rules even at that point.

Animal Shapes, as another pointed out, has a range of 30 ft, so either the elephants can’t fall as far or more shenanigans need to be added. (Distant Spell, if it can be obtained, still only makes that 60 ft.)