If they are calling from California, they are covered by the 2-party consent state law. It's very easy to get accused of wiretapping under these laws, so watch

If they are calling from California, they are covered by the 2-party consent state law. It's very easy to get accused of wiretapping under these laws, so watch out. Last, even if you get such a recording, it'd be an unnamed guy saying stuff on behalf of Yelp. You'd still have to proof it's a legitimate recording, from a legitimate phone call with Yelp.