Seen some interesting FB posts (mostly from US/ UK) to date, but I'm sure it will hit us soon of fairly sophisticated CC scams.
Basically they call you (seemingly having both your CC number and phone number).. claiming to be from the fraud department and querying some recent transactions.
Agree with you that these are fraud then ask you to confirm your ID.
This is typically an SMS that says ..do not read this out to anyone.. but you think you are talking to your bank.
Instead they are live inputting a large transaction into some merchant and you are authorising the charge by telling them the authorisation numbers.
So be aware, read all texts.. and by very suspicious of supposed calls from your financial institution.