Last week, this number started calling my cell phone two or three times a day.  I haven't answered.  No messages left.  It must not be important.
The calls started soon after I mistakenly picked up a call from area code 202 which turned out to be a known IRS scam - a recording saying that I or my lawyer should call back immediately or prosecution would begin.

I called it back without transmitting my caller ID (*67) and it is Home Energy Solutions.

Caller ID:  DHES  Robocall with nice lady on the other end who wants to save our energy costs.  Advised that our utility bills are so low that we don't qualify.   She doesn't stop there.....energy efficient windows, energy saving appliances, energy efficient water heaters, heating, air conditioning.....the whole gamut.   Told her the same thing we tell all of the other "concerned" robocalling pains in the [***].....our son-in-law is a general contractor; take us off your list.   Another robocaller beeped into the call to let us know that they, too, want to sell us something in violation of the DNC.  Number reported to the FTC Complaint Assistance (like that will help!)

This number calling my home phone and did not say anything.
It hang up few seconds later.
It does few times in a day.

These people are really stupid. They've called 21 times in 12 days and have been blocked since call #4, but they haven't figured it out. They get one ring, a busy signal, and then disconnected... they don't get it... duh!