It is obviously a bogus number and an obvious sign of a scam. These operations do not care about the law.

I was called by this number and I pressed 0 to talk to a live operator.  I let the young male with a heavy foriegn accent know that I do not have a credit card and would like to be removed from the call list.  He proceeded to ask me if I was in the bathroom becuase there was an ecco - I let him know I was in my office foyer.  I asked for his supervisor.  He then began making disgustingly obscene sexual and vulgar comments and questions.  Filthy mouth.  Don't answer this phone number - unless you want to be verbally abused and violated.

Most likely a telemarketer. I didn't bother answering because I didn't recognize the number.

I got a call from this odd number on my cell phone, which is not published, so I hung up. How do they get our numbers?

The "card services" scammers don't "get" anyone's number, they use a robodialer, which dials numbers in a sequential order, until someone answers, and becomes their next potential victim.