called once. no message.

Called three times today.  When I answered it, they hung up.  After getting the number from last call activation, the recording said it's not a valid phone number.  ?

LOTS of calls from this number.  The last one about 5 minutes ago.  I have been assuming it is associated with a campaign because I mistakenly told one party that I would help so that I could get them off the phone.  Now I get lots of calls from lots of numbers, mainly Helena, MT numbers.

This number has called several times, and each time I answered they hung up.  Why is it so hard for a phone company to locate and deactivate these numbers , then prosecute the people harassing legitimate phone numbers?

After receiving three calls yesterday, with them hanging up on me after I answered, today when they called, they announced themselves as the League of Conservation Voters.  When I told her I wasn't interested, she said she would call back.