It was a recorded message saying it was from Visa card services saying there had been two transactions, which they quoted where they were from and how much, and to press 1 to talk to one of their representatives if I didn’t recognise them. I hung up and rang Visa card service from the number on the back of my cards and they said nothing had been flagged up as suspicious on any of my cards. Also they said they did not recognise this number.

My experience was the same as detailed by David above. They have rung me on at least two occasions, the most recent being today at 4.09pm. I answered the first call & ignored today's call (they did not leave a voicemail message today!). Obviously a scam call.