Tried to call back but "call cannot be completed as dialed" came up

picked up phone and nobody answers

I did not know the number and did not answer

Received a call from this number and no one said [***]. Tried calling back and call can't be completed.  Some [***] scam artist. You figure you pay enough money that your phone provider can stop this [***]

Received a call from this #.  Tried to complete a call, but unable to complete the call.  Why is that the phone company cannot close down the number.  From the number of comments received the phone company is not interested in helping a subscriber.  Also why place an add to clear someone's criminal record? just who are you catering to?  Just do your job and close this number down!!!