Caller: Said they were from Visa

Said that someone named John Smith had accessed my visa card. The line wasn't good so I said call my home phone. He said he didn't have that level of approval. I said if he was from the bank he would have my home number. He hung up. When I dialed the number back I got a message from Optus that I had either dialed an incomplete or an incorrect number. I dialed twice just to check. Because it looks like they are calling from Queensland don't let them fool you. Scammers.