Yeah I think the only option in which this would make sense for you to peruse legal action is in small claims court for however much you had to pay in refunds. It’s fairly easy to do that pro se (representing yourself). And often companies are motivated to negotiate if they are sued in small claims, because just sending a lawyer to represent them would cost as much, if not more than just paying the damages. Obviously this depends a lot of jurisdiction and the specifics.

But at that point it’s not a question of cost, it’s a question of how much of your time and headache you want to spend. So yeah, probably not worth it