I have come to learn not to take anything for granted with Goldpoints. When I did my silver upgrade they were rather good and gave me confirmation on the spot. The upgrade was posted to my account within 24 hours so this might not be a bad way to go about it if you have the spare time to make the call.

You could of course just try the code online and then sit back and be ready to chase them up but if you have a forthcoming stay where the points bonus would be useful then I'd call.

Don't expect too much from being a silver (or gold) and you'll be fine.