I mean a good rule of thumb when reaching out to a total stranger for something like this is to use a google voice number or something. You'd be surprised how much someone could find out about you from just a reverse lookup of your phone number.
The yelp reviews for this place definitely have to give you pause. I don't see even a single good one. I can't ever remember seeing a score that low for a spa. Has anyone else who's actually been there got any more details about their experiences