I have just received a call purporting to be from BT from Visa telling me that there was a transaction of £600 on my account and that if I did not make it to press 1 immediately. Naturally I did, only to find it was supposed to be from BT about disconnecting my internet. Most people told about a dodgy card transaction would respond similarly so be on your guard.
I would never press any number after receiving a call like that. However, in case some people would it was perhaps a good thing the OPer highlighted it.