@Serg apply()[source] Applies any changes that have been made to the settings. This function does nothing unless self is in ‘delay-apply’ mode; see Gio.Settings.delay(). In the normal case settings are always applied immediately.
IIRC, if Amazon messed up the order and the order is already shipped you're out of luck - as well, they could have added the Prime Eligible item later, the seller.
which has happened to me in the past, but that doesn't help at all