Today, amazon uk sent out a mass email warning many users that they must update their graphics to show free delivery at £5 value, as some people were still displaying it at either £19 or £15. The problem is, the sites showing the wrong graphic have it served via the amazon servers, as amazon have either not updated the graphics been served, or have changed the i-frame code leaving the old code to display the old price without redirecting it. Their own example page is even wrong. https://affiliate-program.amazon.co.uk/gp/associates/x-site/live-examples.html
If it's something that users cannot comply not because of fault on their part, why bother? Those banners will update eventually without your intervention.