Possible region lock issue. Makes sure that your account, game version and the DLCs are all of the same region. But you can try activating the DLCs first. Try this steps:
1. Make sure you are logged in to the account you used to purchase the DLCs.
2. Go to XMB and then to Account Management.
3. Click on the System Activation and choose Game.
4. Click on Activate and restart the console.
5. Go to the game and check if the DLC is there.
Hope this helps