Called my cell #, did not leave message.  Tried returning the call from a land line and the call will not go through!

Called my cell #, did not leave a message. Tried calling back but the call would not go through...I am lucky because it appears it is a big scam regarding winning a trip for $99 to the Bahamas~ Please do not call me any more...I am on the DNC Registry
& should not be getting calls from scammers!!