I got a couple of calls with automated messages stating they "tried to reach you several times" holding my "Google plus business page" and that I should call them back to "claim my Google plus business page."
I also got a call from (321) 233-5902 but I missed the call. I decided to check the number via Google and the search results had many websites where this number was already reported as a scam for gift cards.
I think from now on, if you get a call from anyone not already on your cell phone's directory, don't answer it the first time, then Google the number.
Here are some of the phone number reporting sites. They provide enough cursory information to confirm suspicions that the call was a scam, but keep in mind that some sites will try to sell you detailed reports. These three allow visitors to the site to leave comments.
CallERCentetr - https://www.callercenter.com/
Who Calls Me? - http://www.whocallsme.org/
Mr, Number - http://mrnumber.com/