I never answer calls on my cell that I do not recognize. If everybody did this, maybe they would stop bothering us. These callers need to get a real job.
This is just another company doing a Google scam. Their name is Brand Rep and they are located in Irvine, California. Website addy is http://brandrep.com. Like the rest of these liars they claim to have a license with Google to maintain your search engine listing which is not true. Google does not license this to any outside company or vendor. You will NOT lose your search engine listing or rank without these people. It's just a come on to get you to spend money based on the Google brand name for which they have no permission.
Hey, here's their toll free number. They have to pay for all incoming calls, so call 'em up and pitch a real "you know what". Also, report them to http://donotcall.gov.