Caller: Pretending to be a "bank"

Indian lady saying she was from the "bank" and there was suspicious activity on my visa debit card. I had to ask her 3 times which bank she was from before she pulled Westpac out of the air and went on with her spiel about suspicious activity. I asked her why she didnt say the bank name when she rang, no answer. I asked her to tell me the name that was on the card and account, again no answer. I then told her I did not have a Westpac visa card anyway and she was a scammer and the line went dead.