Caller: scam

claimed to be Services NSW or police regarding odd bank transactions and cancelling or suspending tax file number. Recorded voice using Australian male (accent), sounding very official. Instructed to press 1 to sort. Scared the life out of my elderly mum who was woken up by the call & nearly fell for it thanks to being startled & dazed from sleep. Mum's had the same call from 3 or 4 different mobile numbers so far