I have been spending days with tech support and they are clueless as to why this is going on and really do not seem to care. I think I will cancel my live membership and buy a ps4
I have been doing the same thing for the past several days and agree they are clueless. If you know of anything else we can do please let me know.
Hopefully it gets fixed soon 
Please use this thread to track the current issues
https://www.halowaypoint.com/en-us/forums/36cecc379ca14abd918029d359551927/topics/halo-4-servers-down/ee31a9a5-5857-42ea-a899-3ae1b7bba90e/posts?page=1