Hi, not sure what else to suggest, I'm afraid.
When I click on the link above, it shows the price as "Free" with a button underneath to download to my PS4.
If I view the page for the Season Pass, oddly, it tells me the price is "£32.99", but there is still the option to download to my PS4.
Do you have multiple accounts? Is there any chance the game could have been purchased under one account and the season pass under another? I'm sure that's not the case.
Have you tried re-downloading the season pass as well? Is it the same there?
It might be a "contact Sony time", I'm afraid. Hope you get it sorted.