Gamertag changed with wiped stats

So I changed my gamertag and now my game history is wiped and it won’t update and my old gt is listed in my company still. Will it ever update???

Your Halo 5 stats show up here on Waypoint and the Spartan Company should update soon. For older games you’ll need access to your 360 to resync your stats, connecting with an active Xbox Live Gold subscription and playing some campaign, customs or multiplayer should be ok. If you had Halo 2 stats on your old tag they won’t resync though. Halo 2 ran on the original Xbox Live servers which are no longer operational.