I trust Mocality's technical chops enough to believe that the IP traffic is coming from where they say it's coming from.
I agree with this.
the callers claim to be from Google, and Getting Kenyan Businesses Online is a genuine Google initiative
Claiming to be a member of something legitimate on a phonecall is scamming 101 - it's usually very hard for the person on the other end of the line to verify it immediately.