Redeem Codes for Sims 3 packs

Hi 

I am trying to reinstll some of my games for the Sims 3 franchise but its saying that some of the codes have been used. I have checked my account and they are not showing up under my library so wondering why I can't add them on. I have 8 games I want to add on but 3 of the codes are not letting me add them. Please help so I can continue playing Sims 3