Calls and hangs up leaves no message

Got a few calls from this number, no message left.  guess it's not important.

Some idiot who doesn't know how to program his autodialer so it plays a message when someone answers. Honestly, they need to give an IQ test to these morons before selling them an autodialer as 95% would fail and stop all this nonsense from happening.

Calls with no message to my cell number. Call back and it hangs up immediately. I have blocked number.

Received call from 719-679-4010, Trinidad , Colorado.  I thought it was a call from relatives. It was a call saying we were selected for something.  I immediately hung up.    Called the number thought my cell,  and received  message saying that the number was a non working number.  This is must be a definite scam.   I blocked the number