You can file a complaint here https://oag.ca.gov/ this is not like filling a lawsuit but often gets good results. The AG is like the lawyer for the state. Considering baremetrics is based in san francisco, you might get some interest.
Likewise you could file a complaint with Stripe.
What we have here is inexperienced people in a startup acting stupid, but a little suggestion from the attorney generals office or their payment processor usually gets some really good attention.
Complaining to Stripe is the best option. Most of their business is based on Stripe Connect. If they ban Baremetrics from the Stripe it will lose their business.
Wow. If I were in your shoes I would have gone from not wanting to call to being glad I get to call. Count your blessings, you get a chance to call Brian and give him and ear full. I'd tell Brian I'm recording the call as well.
What's crazy is that they have to pay a fee if they lose a chargeback, so this is essentially a revenue-negative move in addition to being terrible PR.