Campaign data gone

Today i got on halo and played some matchmaking then i decided to play on campaign and found all my campaign progress was gone i know this has happened to other people but i cant find a solution anywhere! Can someone give me some help here?

Come on i seriously beed some help here!

Don’t worry, this is actually a glitch.

It happened to me.

Your only bet is to play through it again. Just play on easy (You have completed before yes?)

Well that’s just great it took me months to beat it the first time and now I have to do it again

> Well that’s just great it took me months to beat it the first time and now I have to do it again

You’re either the slowest gamer that I have ever seen, or you are the worst at halo.