Received a call from this number (07) 5564 7550) on my mobile all they did was stay on the line for a minute or so, I heard other people talking in the background, but the person that called me did not answer when I answered and introduced myself and I asked them what I can do for them, so I hung up. People clearly have to much time on their hands. I called the number back from a private number and was told that the person I was trying to call was not available.