How do I make it stop

Received call, did not answer, no message left. Number now blocked.

I was called form this number about my electric bill. I have been called about a dozen times so far. If you press 1 to get to a human, they try to sell you on solar. I started to explain that I didn't want to be called anymore, and they hang up before you finish asking not to be called! After just hanging up the first few times, I tried pressing 1 to get to a person to explain that I didn't want to be called, and both times they just hung up before I finished the sentence.

Harassed a number of times, then started keeping track.
Received call 7/6/17 at 6:25, took option to discontinue calls, but made no difference.
7/13/17 at 12:52pm, took option to speak with an operator, person hung up as soon as I started saying I wasn't interested and just wanted the calls to stop.
7/17/17 at 1:17pm, took option to speak with an operator, person hung up while I asked to not be called again. I led with "please help me get these calls to stop" but they hung up anyway.

We got a call again from this number today at 11:56 am. The caller ID was still KINGSTON MA, and it was blocked again by our call blocker. They need to revise their robocalling software to eliminate numbers which block their calls. Please see my post of 11 Jul 2017.