Beware of this New Visa Scam Phone Call!
I groggily answered the ringing phone at 6am, and was alarmed to hear an official-sounding robotic voice. “This is the alert system with Visa (or Mastercard) account services!” It went on to tell me that there were two suspicious charges to my Visa card.

awesome, these guys helped me, i am glad i found them
I rang them thinking they were BT, as they had BT/Yahoo on website. They entered my computer and told me I had been hacked and needed an expensive security. I then realised they were not BT. I restored my computer to a previous setting as I didn't trust them. I then spoke to the real BT who gave me proper advice. I felt I had been conned though fortunately I had not paid out..