
This was the response from support to a clanmate of mine who had the same issue:
He put in a support ticket roughly 1 day after getting the 6th champ and still hadn't received the bonus, then about 12 hours after getting that reply, the bonus gift came through with the avatar and relic and whatever else is in it.
In other words, give it a couple days, and if it still hasn't shown up, THEN contact support.