Not getting any droid brains from assault battles

The past four days the game has had both Duel of Fates and Peridea Patrol assault battles. I have invested relic materials so I may complete tier 6 of both these assault battles, I may then receive droid brains as a reward. Out of all four days I was rewarded no droid brains. Are you freaking kidding me. What is the point of having droid brains as a possible reward, but you never are rewarded them. What is the point of upgrading these toons to relic 9 if you don't receive droid brains as a reward.