Plant run over by caterpillars, searching for a name

This morning went into garden and this plant got dessicated by these caterpillars . I don't know it's name , but it has long sleek green leaves , with small white hanging bells .
It has overgrown from my next door neighbours garden , under the fence , and has some kind of thick root .

I would be curious to know it's name and a preferably natural remedy for these feasters .