call centers have thousands of phone lines and typically uses several hundred at once for a automated call campaign.   Nothing fishy there...not to defend them.  But different numbers is no indicative of whether a call is legit.

it is against federal regs to place automatic calls to your cell, wireless, or mobile phone,  The FCC is the regulator and the fine is as much as $16,000.  Sometimes accidents happen but this does not seem like one of those.  You can file an FCC complaint on line.  Problem is FCC is swamped with complaints and if FCC does go after them, they will probably dissolve overnight and reappear as someone else doing the same thing.  FCC is going after some cases though--I have read that the FCC is going after FaceBook for this.

I just received a call from 321-594-4796 about the windows computer I have in my home. It was reporting to the main windows server that I have errors. When I told them that there is no such thing as a 'Main windows server' he tried to assure me there was. When I told him I didn't own a windows computer, he said why the f*** are you asking all these questions then and hung up.

Another blocked number to add to the list. Thanks for the feedback! :)

Robo caller, started calling my cell phone several times a day about a week ago. I usually ignore. They don't leave a message. Today I picked up just to see - recorded message saying I had won a cruise. Yeah, right. Blocked it.  I am in California.