Received a call from this number but could not hear what he was saying.

Call every hour for days. Changing the reason why I have"free" money. Really?
One time student loans, one time IRS government funds, one time money that I could use for "better me porpose".
I tell them I will use it to hire a hit man to kill my husband and collect on a 100,000 life insurance policy. They told me, ok.
I heard if you keep them on the phone for 2 minutes, they lose 87$ every time. And if we all did this, they would be out of business in 2 weeks.

" I heard if you keep them on the phone for 2 minutes, they lose 87$ every time. "
Where did you hear that? A gossip circle?
The people making these calls are probably in India, Pakistan, or Indonesia.
They are not making anywhere near "American minimum wage" at all.

Called I answered but they didn't say anything.  I called number back man answered then hung up without me saying anything.

Called, left no message. I called back again, "Joe Anderson"  (LMFAO) was calling to give me a $9k grant, because I'm such a great person.  LOL  SCAM! SCAM! SCAM!