Caller had a think India accent. Knew my last name, I didn't say who I was but asked who he was. He said something about Medicare & tried to ask a question. I kept saying "If you're from Medicare, why does your number come thru as an "invalid number"???? I kept saying that, not letting him talk & he hung up. They called 3 days ago from the same "invalid number but hung up when I answered the phone, HELLO INVALID NUMBER.