Caller: Said he was from Bank SA

Said he saw an unusual payment from our account of $700 to a Ryan Miller that they had held. I told him we aren't with Bank SA and hung up. Later he called again saying he was from the commonwealth Bank saying the same thing. I said I didn't know a Ryan Miller, they he said he needed to cancel the card, would send a new one and started asking me for the details on my bank card. I said no, but he tried to explain that it wasn't my bank details he needed, just a client number, I told him I would go to a branch to sort this out instead and hung up. He hasn't called back.