calle4r listed as unknown. Tried to call back no answer

Have received a call from this number twice today.  When I answer, no one says anything.  I called the number back and the phone just rings and rings.

Call from 4052370719.  Recording claims to be Google offering to list my company first in the search results or if I don't take it up on the offer, they'll give the offer to my competitors.  Obvious fraud.

same as above. noon Saturday. robo call to place my business at the top of google search. press 1 to talk to agent, or 2 to be removed. I pressed 2 hoping it works and they won't call back.

Telemarketing Call... when asked to be removed from calling list he hung up on me.  Tried to call back but they won't answer.