halo 3 matchmaking ban

hi there i was banned a few yrs ago on halo 3 matchmaking because my old service provider was rubbish i got numerous complaints but now i have a new broadband provider and i wanted to ask if i can get the ban lifted i contacted xboxlive and was told to post on this website i really hope some one can help my gamertag is master in ryan xboxlive gave me a ref number 1168671908 they seemed to think that because of the lengh of time and the reason some one could help kind regards master in ryan