I received a call from 318-7000 they hung up when I answered. The caller ID said 318-7000 Blocked Name.

I've received 2 calls LLM SUCS at this number on my caller ID.  When I answer, no one responds.  I'd like to know who is originating these calls and how to get them stopped.  I am already on the Do Not Call List.

why do I keep getting calls from this number

Got a call on my cell phone and when you call back no one anwsers.It is wasting my minutes and pising me off.