Once the dispute was resolved on the card side did anthropic claw back the $100? Was your account penalized in anyway?

That's the thing, right? I would not be surprised if they have an agent that bans accounts that do chargebacks on them even when they're wrong. So you either accept it if you have to use it for work or you risk and deal with the possible consequences.

Nothing so far, but I'm keeping an eye on it and debating just canceling entirely.