Go for it! Dd once got a jewellery box as a present which you decorated with sticky gems. Except the shapes of the design on the box didn't match the sticky gems which would have made it pretty shit looking . A quick email to them and they sent a whole new set out to us.
(Younger dd was over the moon as it meant she could destroy decorate the first box herself)
They responded, very quickly I must say, and have said they are sending a replacement copy (not sure whether that's magazine or stickers but either is fine - I still have the magazine) and a complementary copy of one of their other titles.