Calls and hangs up after you answer. You can hear people talking in the background.  I tried calling back and I get a recording number has been disconnected.

Just got a call from this phone number. They are trying to sell air conditioning/heating service. When I told the caller that I was not interested and ask if she would take us off of her list, she proceeded to tell me that the call was about our heater service as if we already use them to do so. She lied to try to make a sale. As I was hanging up, I said, "Yea, whatever" and she repeated what I said in a snarky voice.

I have my call blocker set to not drop spammers, but send them to an answering machine.  The woman on the call obviously was not having a good day trying to find victims.  In a very disgusted voice she said " Hello.......Hello.....Ugh!".