Who called from 3120984765

Called me and didn't respond when I said "hello", but didn't hang up either.
I sat there silently for a couple minutes before they finally hung up

Called me twice and hang up right away. No message left. Weird.

Called my cell phone twice. No conversation, just silence. BLOCKED!!

I want them to quit calling me,they call every day.

Called my DNC cell phone, left no message. Blocked the number