The Moonrise deluxe bundle includes all skins, but none were received after purchase.

After I bought the pack and activated it, there were 5 activation keys, even though the original product had 12, with the 4 skin packs and 3 individual skins missing. How can I contact support or fix this? Please help.

Source: https://store.steampowered.com/bundle/15781/The_Battle_of_Polytopia_Moonrise__Deluxe/