Caller: Someone claiming to be from NBN

The asian guy sounded somewhat legit explaining something about the copper cables and optic cables being damaged, but judging by the background noises & other giveaways, it smelt fishy and I said, I'll ring NBN myself, to which he instantly hung up. But since picking up on that first call, Ive had 7-8 calls all arvo from that same number!! I think it pays not to pick up in the first place.