I immediately hop on customer service chat to ask for a refund. I was surprised to be talking to an LLM rather than a human, but go ahead and explain what happened and state I want the transaction for the subscription canceled. It offers to cancel the subscription at the end of the 30-day subscription. I decline, noting I want a refund for the subscription I didn't intend to take. It repeats it can cancel the subscription at the end of 30-day subscription. I ask for human. It repeats. I ask for human again. It repeats. I disconnect.
Amazon knows what it's doing.