I received two calls from this number on my cellphone in the past two days; the first call, they don't leave a message.  Today I did answer, they immediately hung up (I could hear what sounds like a call center in the background).  I decided call back from a land line, and when someone picked up, they answered with a hello and I asked who they were.  Click.  Same call center-like background noise.  Blocked the number on both phones.