Caller: Scam company claiming to be some NBN related business

An Indian guy called me saying his name is John Williams (very fake name) and is calling from NBN. He claimed that he works with NBN connected to my place and there is a security issue with my IP address. I asked him what my address is and he couldn't answer instead he mumbled with technical terms like 'database' to evade my question. Then I told him I don't use NBN and he said it's about my internet not only NBN. Then I didn't want to waste my time anymore so I just hung up. Btw given the background noise, there seem to be a lot of people in the same office calling up people to scam them.