they keep calling and hanging up

I just got a call from this number as well. itwas dead silent on the other end. so i hung up.

Person needs dialing skills..

They called me twice while i was at a concert.  called back the next day,  and the person who answered was 'Mike' and hung up as soon as i said 'hello, i'm returning a phone call'

also, the call is from Lomita, Ca.