I would imagine there aren't a lot of precedents for that since I believe it is basic contract law.

Once you make a deal with someone you can't just turn around at some future point and say "ahhh I changed my mind, here's your money back so I no longer owe you any obligations" (unless that option was specifically part of the deal).

There are also things you can't contract out of either, which is why the whole "well we said it was final sale only" bit is a hilarious joke if there is legislation that says something to the effect of "if someone pre-orders a product and you don't deliver within x days, you are obligated to provide them with a refund if so requested".