This occurrence has nothing to do with AI? The reason AI doesn't want to grant you the refund is because it's not been given the ability to do so. It would be no different with a human.

If Amazon wanted to give you the ability to get a refund for unused Prime benefits, it would allow the AI to do it, or even give you a button to do it yourself.

I can't really argue this except to say trust me, bro, I've been an Amazon customer for over 20 years, and there has never been an issue, no matter how unusual, the CSR was not able to resolve inside about five minutes. The LLM was completely on rails with only specific whitelisted actions available to it. Even if a human couldn't do the specific action, they could explain why instead of word-for-word repeating an irrelevant part of their script.

They don't trust the LLM so they cripple what it can do, would be the generous interpretation. I actually think they're intentionally crippling the LLMs' access to accounts, though, to reduce their spend not on CSRs, but on CSR actions for, for example, refunds, where the LLM becomes an excuse for the change; they can hide behind what they'll call technical issues or teething pains.