I bought the game and i still got the cap on lvl 13 act 1

hey, i bought the CD of the game diablo years ago and i didnt play it till now, 3 days before i decidet to finally ply it with one of my friendn because u could give him a gift code which was part of the packaging. But after lvl 13 we couldn´t have more experience and we could only finish act 1 of the game. How is that possible when i have the full game on the CD and i gave him (my friend) a gift code on the full game (guys i paid for it). Please give me some explanation or tell me what to do. Thank you.

that sounds like the old Beta, now Free Trial version as the full game has no such share code (I have D3: Collectors Edition) it had two WoW and two SC2 codes though but not D3