The call came in as XXXXXXXXXX   Seriously!!!  I called the number back and no surprise, it's bogus.
Now, they can never call me again.
Buy a call-blocking phone.  
Uniden and Panasonic make wonderful call blocking phones and they're inexpensive.  They also come with at least one wireless handset.  Very handy!!!
These phones also block “Out of Area” and “Private” calls.
Just last week, I purchased a Digitone call blocker and put it on my business line.  The first day I had it on my business line, it blocked two telemarketers.  This device also blocks entire area codes such as 702 - Las Vegas and Washington state area codes 425, 506 & 253.   All those area codes are now blocked.  Soon, I will be purchasing another one for my home line.

they called but left no message. we don't take any call that we don't recognize.

Same here.  No ID, no message except saying "Hello, hello" into my voicemail.  Blocked and reported.  Aggravating morons.

leaves no message..caller ID XXXXXX CA

you can waste your time with filing useless reports or buy a call blocker....search for phone blocker..the one i have,has 1500 number blocking capacity..dont buy phones or blockers with 50 or 60 number capacity..you will run out of numbers in a couple of months.
These criminals will not stop calling..so do yourself a favor and buy a blocker.