PROBLEM WHEN PLAYING AND NOT GETTING XP POINT

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I HAVE BEN SINCE THE MERE DAY HALO WAS REALESE AND I HAVE NO CODE FOR UNLOCK ANYTHING
BUT EVEN WORSE EVERYTIME I PLAY THERE ARE NOT XP POINTS AT ALL IS TRUE I WAS USING DORITOS XP CODE BUT I THOUGHT IT WAS ONLY FOR A DAY BUT NOE IT TAKES MORE THANT 2 AND I STAR TO WORRING I SHOULD BE LEVEL 80 BY NOW… BUT THANKS TO 343 I CAN EVEN PLAY … WHA T IS THE POINT ?
IF I PLAY THERE IS NO REWARD!!! IF ANYONE KNOWS WHAT TO DO IT WILL BE SO VERY APREESSIATED