It's gotten worse very recently. Agreed they are usually on top of complaints. Keep in mind Amazon charges third party sellers a ton and passes the fees on to us, so they can afford a refund here and there.
https://www.forbes.com/sites/pamdanziger/2021/02/05/amazons-third-party-marketplace-is-its-cash-cow-not-aws/?sh=908742521c03
Like all companies they're shifting to shaft the user.