I called it back and it was illinios auto insurance. But the caller ID show california.

I called the number back.  Said they were Arizona auto insurance verifying my info to update my insurance carrier.  Prob 1) they called me by my maiden name and my insurance company has my married and Prob 2) my premium just renewed.  Lots of back peddling when I brought this up to the caller.

Called me relentlessly for about 3 weeks.  Requested no call list several times to no avail.  Each I spoke with them, they reported that they are with Colorado Auto Insurance, a company that doesn't exist.  When asked to specify affiliations, they reported that they "are affiliated with all insurance companies in the U.S."  Which is ridiculous and was frustrating for me due to the fact that the person stating had a Mideastern accent.  I asked to speak with a supervisor, got hung up on.  Called back several times, was unable to speak with a supervisor and hung up on each time when I requested a main contact number/name for the company or to speak with a supervisor.  What the hell is the deal with these people?!?!?

called and wanted to update insurance info. Knew my auto ins company, my home address, make/model/yr of vehicle, birth date, name. Seems pretty creepy to me!

they called several times and hung up when i answered the phone, finally they talked to me this last time and wanted a family members insurance information, address, etc. said they were from Illinois insurance company associated with our insurer but didn't know who we were insured with

i would advise report to local authorities judging by comments above