I suspect this is the same guy with the Indian accent claiming to be from NBN calling about my slow internet speeds. I did not pick up and the guy left a random "singing" message which I did not understand. Suspecting phishing phone call and the guy was trolling me leaving the voice mail.

Called me on 4/4/22 did not say anything on the phone

Called my mobile 19/01/2022. Said they were my NBN provider located in Melbourne and there had been a security breach of my account. Suspected phishing scam.