Originally Posted by
ffay005
...
I don't know if upgrades are cancellable. But if so, would you add it to the upgrade topic Wiki? (I remember having read about a case here where seomeone wanted to cancel their upgrade, but Y was fully booked and he wasn't allowed to do it.)
After a surprising turn of events I can now confirm my personal experience that both voucher and points upgrades are cancelable. Added it to the wiki.