I'd always thought if you bought the full collection, even not as a set, you would be able to use the discount - guess that means I've never bought a full set to try it out! They're usually fairly nice at Glam, hopefully they'll sort out a refund on that for you. What else did you get? They still have the three older polishes I fancy available for the UK, hopefully still be there next monthJust bought the cosmic holos plus 4 other Glams from older collections. It's annoying how we can't buy them as a set, therefore can't use the 10% off code. I did ask in the group if she would refund the other 5%, we'll see.