Caller: Scammers professing to be nbn

Michael employer no. 08600054 says, will someone be home as copper wire will be replaced by optic. Then ask you to do a speed test. You give them the results. They even give you nbn number. Put you onto a supervisor who starts a long winded spiel. I told them I am ringing nbn right now on my phone. Please hold. I could hear her desperately trying to tell me no reason.....she hung up