Any “power dynamic” is not the point. You bought something and then tried to circumvent it to get your money back while keeping the content.
Does Sony’s refund policy suck? Yep, it does.
Is what you did essentially stealing? Also yes.
Doing chargebacks is a common scam btw. People will buy something, get the item or service, then do a charge back to get their money back, with the bank/provider doing it and then putting the burden on the retailer to prove that the person got what they paid for, which is often impossible.
Think about it like buying something on eBay, getting it, then asking ebay for your money back saying that you never received the item.