Bought $40 worth of Blitz Packs -They never showed

So i am sick, i was given my christmas gift money early because i wasnt going to make it out to see my family this year, spent $40 on halo wars 2 on Blitz Packs, and they never showed. there is nobody to contact , no way to rectify the issue as far as i can see. what do i do to get my packs?