Who called from 7049353477

Called 6/25/2014 did not answer. Caller did not leave a message.

Called June 25th 2014 @ 8:30pm.  Would not say anything when I answered, then hung up.

Answered and it took a moment to respond with a Computer sound voice "hello" replies....I hung up.
If not a human on the other end, no desire to further on

Robocall.  No message.

I was immediately suspicious because I don't know anyone who lives in Kannapolis, NC.  But not only that, just the other day, I decided to block 704-218-6152 because of incessant calling to my home and never leaving a message.  I'm wondering if this # 704-935-3477, is just another roll-over (alternative)  number from the same source. Who knows? I wish these ppl would get a real job!