the usual scam - press 1 to update your free Google profile. These scammers aren't affiliated with Google, and I seriously doubt they can improve jack squat. Best thing to do is pick up the phone but don't say a word - if it's a robo-call, it'll record it as a dead line or a voicemail. Eventually they give up. Although word of warning, they have HUNDREDS of spoofed numbers, they'll just call you from another number. Been there, done that, have the badges to prove it.