got a call from this number today if you call again i am doing something about it

Tried answering and they wouldn't say a darn thing then they hung up.  How do they get our phone numbers in the first place??

Caller (Mike) stated he was from Education Resource Center and asked if I was interested in continuing my education.  Caller ID stated YMAX COMM. CORP.  I told him this was the 5th time in 6 days his company called and asked him to remove my number from the call list. He state he was not authorized to that. I asked to be transfered to a supervisor, he stated he was not authorized to that. I asked why the caller ID stated YMAX COMM. CORP, he hung up!

Educational Resources - College Online Telemarketer.  Also get calls that just say 001 or 002 on caller ID.  Asked to not be called again - but they keep calling.

Called.    Didn't know the #   answered.   Quiet.  Nobody would say a word.   Hung up.