Caller: NBN apparently

An Indian guy called apparently from NBN. Asking me to check lights on machine due to service dropping out. Called them out as a scam. He then quoted my name and full address of previous house I lived in. Told them haven't lived there for 9 yrs. They hung up. Messaged ex and gave heads up. He said he isn't on NBN. Obviously it was a scammer. Just with more info than they usually are.