received calls 2 days in a row and nobody was there

She knows my name saying they are giving me 200$ discount for my electricity, I ask her which company she from, but keep saying she is giving me discount, I kept asking where she is from, and ask me do I understand english, I told her I don't, and switch off

Caller: (02) 8354 4614

Automated voice in American accent saying they were ANZ Bank and someone had just withdrawn $1000. I hung up after that.

Called 4 times, each call has ended immediately after answering

Answered call but nobody was there I hung up.