Halo 4 Specilization Message Not Gotten?

My friend and I were in a party and he told me that he got a message with a code in it from Microsoft. He got the game 2 weeks after it came out while I got the game and played it on the day it came out. I never got the code for 6 specializations… Can anyone please help?

i never receiuved my e-mail for the 6 specializations code .how do i go about getting the code

i never received my e-mail for the 6 specializations code .how do i go about getting the code