Firstly I received a call from this number saying they were from VISA and there were fraudulent transactions made in the early hours of the morning, then they gave me a bunch of details about the transactions, employer numbers and case id info to give to the bank. Then they were transferring me to the bank headquarters for me to deal directly with them, I hung up to contact my bank directly as I was feeling suspicious and immediately got a call from a NZ number, hung up on them and then got a call from a melbourne number. I informed the male I was calling NAB directly in case this was a scam and he proceeded to call me a "Mother F**cking Daughter of a B**ch" and wished me to hell before I hung up and blocked all 3 numbers.