My stats on halo waypoint will not update?

Ok its been 5 days and its really -Yoink!- me off i cant do custom challenges because it says my old gamer tag made them?I changed my gamer tag 5 days ago and now my stats will not update on this site?or bungie.But if I play a game they will update then when I do a mission in campaign and come back there gone PLEASE HELP