Can't play online but i have level 21

I want to play with anyone, I have a level 32 Psycho and a level 21 assassin.

I'll play with you. I have a level 21 siren. Having some difficulty playing by myself. It goes a lot easier with friends.

no i can't even play online with the game. When I got to online all of the levels are grayed out, I can't select anything

It is possible to go higher than level 20 somehow

I was playing Crucible earlier and saw someone who is level 21

I started playing halo 4 when i was home for University break. I leveled up to 21 beat the first 3 levels on Legendary solo and played Spartan ops.

I have a Xbox usb memory stick that i use to take my profile to school to play on my friend's xbox.

The problem is i can't connect to 343 servers ....

The strange thing is that my friend can on his profile, so it's not an internet issue because are on the same network.

It fails load my service record, so I appear as the default spartan but level 21.

All my progression through the campaign saved. So I've been continuing through solo legendary. So my saved data is present.

Strangely the game starts to allow me to proceed to matchmaking and spartan ops, but then changes its mind and decides to tell me I cant connect to servers.

It changes from showing thousands online to less than 300.

LAME