You pay a company to have a service or product rendered. It's not my job to investigate Amazon's supply-chain to make sure that can actually deliver my toilet

You pay a company to have a service or product rendered. It's not my job to investigate Amazon's supply-chain to make sure that can actually deliver my toilet paper in 2 days. They are promising me this service and now it's their responsibility to deliver on that. If those services/product aren't rendered, then a refund should/can be demanded. I think this was completely within ethical bounds, assuming a promise was also made to return money if services weren't rendered.