Call center....background noise then they hung up

Scammer number in use again but my call blocker blocked it after the first rang.

Found them in w/ diff caller ID but same # on these days:
8/30 7:44 p.m. 7859265:4803768
8/29 9:03 p.m. 7900539:4803768
8/29 7:05 p.m. 7838789:4803768
8/26 8:49 p.m. 7850870:4803768
8/26 6:50 p.m. 7802641:4803768
8/25 8:23 p.m. 7907349:4803768
No msg left but may have been blocked by our robocall blocker.

At 5:54 PM on 9/8/2016 my home phone caller ID shows INCOMING CALL called. I will never answer calls with improper ID info and caller left no message so this call could not have been very important.

9:00pm here in SoCal. Received a call from this number, but got to the phone too late to answer. Caller ID said "Riverside CA". I generally don't answer calls from numbers I don't recognize anyway. Unfortunately we have had some important calls with unrecognizable numbers that have this kind of Caller ID, and without answering we can't tell which is which. Sucks.