Who called from 3072151007

Get calls from this # but when I answer there is no one on the line.  When I try to call it back the operator says it's not a valid number

Lady asked me if she could speak with the man of the house. I answered, you're speaking with him and then the call dropped or she hung up.
She didn't mention any company name.

Get calls from this # but when I answer there is no one on the line.

Got a call at 2:30pm.  No one on the line when I answered.

Call came in and did not answer.... getting a lot of random calls from marketers.