I just had a phone call, and when I answered, it was an automated message telling me that my internet connection was going to be disconnected within 24 hours as my IP address had been compromised from several countries. They said my IP address would be changed, and I should press 1 to be connected to a technician.
I did not press 1. I am assuming that, if I had, and had followed the technician's advice, they would have had access to my computer and all my passwords, bank account data etc.