These people need to stop calling. I answered once, and told them I am not someone they can do business with. They continue to call.

they are calling me two to three times in a day even after i told them to stop

It's a company called "Go Green".  We called the number back.  They have been doing the same with us.  Likely it's a dialer  system.

I get a call from this number about once a day also.  No voicemail. The times I answered, nobody is on the other end.

I'm getting the same calls with no messages also.

They keep calling me, never leave a voice mail. That's what I get for getting a new phone number, got one that someone in the past listed as their contact. Irritating as can be.