Caller: Someone pretending to be from the NBN

When I answered there was a slight delay before I heard background noise so I knew it was a robodialler. The caller said hi I’m (inaudible) how are you today? I asked who was this and he asked for Mrs (surname). I asked again who was calling and he then attacked me saying he was “from the (expletive) nbn you (expletive mother expletive)” then pressed a button to make the phone squeal in my ear. I laughed and said ‘excuse me’ but he kept pressing it so I kept laughing at him. I don’t think he liked it as he swore again and then hung up on me