Help please! : Servers Unavailable

" The Halo 4 servers are not available. please try again later. Matchmaking has switched to using the default playlist. "

Things to know -
-My Nat Type is open
-I restarted my router, i even tried restoring factory defaults
-All my friends can join each other, but not me
-I can’t join anyone
-My Load outs were all deleted

if you have an idea about what is wrong please let me know!