Been getting all kinds of strange calls lately. Some from Texas and now this one. I answered the phone and a guy kept saying "can you hear me" And I would say Hello again and he would repeat himself, even asking for me by name. He hung up after that. They never leave a message and when you try to call the number back, all you get is a recording that I'm sure nobody ever picks up. It feels very violating to have this happening. I have to un-plug my phone all the time now because of this. What can be done to stop this?