So I redeemed my instant hunter and monster expansion packs yesterday and they seemed to be working (only used the Goliath skin once and only played tier 1 but tier 2 was unlocked), today fired the game up and all gone! Re-entered codes and back again. Hope I don’t have to do this daily!
It is a known bug on the 2K server side. It is being worked on as we speak. Thanks for the bug report!