called in the evening asked if my mom or dad were home.
called in the morning and hung up.

Received a call from this number at 7:08 pm last night.  I did not recognize the number, so I did not pick up.  The caller did not leave a message, but does call often.  Very annoying.

We have received calls from this number 4 times now, always in the evening. We pick up, and nobody ever says anything, they just hang up. Very weird.

They call daily, but never leave a message. Irritating!

I called this number back and a recording said that I had reached TJSI.
Strangely enough, I received a call earlier this week from a 209 area code, called them back and LO & BEHOLD a recording saying I'd reached TJSI.
So, I suspect one can not block these people; they just use a different number each time you block them.