You could be the victim of a card security breach. They will ask you to confirm your card details or your bank and then pretend to hang up. You dial your bank's number but the fraudster is still on the line and pretends to be from your bank. They ask you to confirm your account details and the PIN code for your card. If you do they now have all your details and proceed to use the card online. Ignore the call and report it to your local Garda station.