There are a few posts on this subreddit from a Tommy's rep, u/Jesusismycurseword.

And if your search 'Tommy' on here, you can read about other customer experiences with them. At least their customer service seems legit.

IDK if Flagship also does this, but if you install the Tommy's app, you get a month of free washes, so you could try them both and see who you like better.

https://play.google.com/store/apps/details?id=com.superoperator.tommyexpress