If you have had a call from 02 6188 5154 you are not alone.  Some of the time they will simply hang up as you answer and sometimes they will actually talk.  It seems to be a competition scam they are running from this number. They try and get you to enter a competition with $250,000 in prizes up for grabs.  They also have tried to say you are in breach of contract in some of their calls.  It definitely doesn’t seem like a legit company.  When I looked up the area code it shows up as being from around Yass or Canberra.  Now interestingly I have a new mobile phone number and I have only given that number online once and that was The Little Yellow Envelope so I am thinking that quite possibly it is linked to that, if not then it is a high coincidence that I started receiving those calls after signing up with them.