Wha happened

I live in Australia and i was playing halo 4 before i fell asleep and i got the monthly and one of the weekly challenges in on game and i wake up this morning and i have been demoted two ranks and all the xp that i received for the monthly challenge. Why did this happen? My acount is StringTheory73X. Is it possible to get the xp back.

Vote whether this has happened to you.

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