Ive got a problem PLEASE HELP!

I downloaded my gamertag on my cousins house this holidays , but niw that i arrived home i wanted to play some halo 4 campaign but theres the problem , my spartan got “reset” i had to make all my loadouts and customize my spartan again , nothing to worry abour , but then i checked campaign and my levels are gone , i have all the halo 4 achievements i can prove that i finished it , check my service record
Any solution?

No one?