Came home and put in my code for 75,000 VC it worked, but then when I got into NBA 2K15 it hadn't added it to my total VC. So I read somewhere else that a guy had the same issues and he came back to it an hour later and cut it back on then it added his VC. So I came back to it about an hour later and same thing for it was finally added in.
I believe you had to redeem it by yesterday If you are talking about the one included with the psychical copy of the game. It had a expiration date on the back.