If you want speed up the process of getting reset, then I suggest tell your friends to File a Complaint on you for Tampering>Cheating.
About Gamerscore corrections
A gamerscore correction occurs on a player’s LIVE account when they gain achievements through avoiding game play and the use of external tools. LIVE is committed to keeping the service free of this type of behavior as it violates the
A LIVE player who obtained their gamerscore in this abnormal way will
Find their gamerscore reset to zero, and
Be unable to regain all previously earned achievements, and
Be labeled as a “cheater” for the community to view (for members over 18 years old).
While players who have been identified by these criteria will start from a zero gamerscore, they will still be able to gain achievements for future games. In other words, we give them another chance to earn future achievements by earning them as
other “fair” players do. The original gamerscore correction will remain permanent without any way to appeal.
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