Apparently, a new scam has replaced the other ones listed above. My call was a robo call, listed on caller ID as Customer Service and telling me about reducing my electricity bill by 60% 'permanently' due to a new bill just passed by Congress. At that point I just hung up and blocked the number.
This is getting ridiculous now, up to 158 blocked calls since last December.
Gotten a few calls from them. To reduce electric bill, etc. etc. Now what I do is ... Phone rings. I hit talk button ... then I hit end call button. I like hanging up on them! :)