Caller ID said J2 Global Communications they asked for me I told them I was on do not call list and they hung up.

I have no idea who this is -- I never answer calls from numbers I don't recognize.  They didn't leave a message.  I suspect a f***ing telemarketer even though I am on the do-not-call list.  I have added them to the ILLEGAL CALLS contact on my iPhone so they will get a silent ringtone if they call again.