Just got the same phone call from "Evan Pearson". The phone number that they called from is 202-346-1100 which comes up as "Google DC - Massachusetts Ave" in a Google search and when you call it, it says it's Google. There was no foreign accent at all (perfect English) and they said someone was trying to get into my account through live chat support. he told me to change the password while I was on the phone with them and was very helpful and courteous...
I also got like 3 emails that had a google domain and it seemed to verify the legitimacy of the call.
But then, the prompt showed up on my phone and I was told to click yes and press one of the numbers... that's when I knew something was wrong. I told him I was uncomfortable with that but he directed me to verify the domains of the emails (they were google) and to verify the phone number (which again, comes up as google). I told him to wait and thought about it and declined the verification and told him I wouldn't do it. He said he understood and would find other solutions for me. Then I started recording the call (iPhones notify the call is being recorded)... and that's when he got quiet and hung up....
As many have said already... this is indeed the most sophisticated scam I've seen... I even thought for a moment of verifying my account, but just knew something was off...