Steam I Can't Seem To Purchase The Free Pack On Steam

Hello, I own TSW5 & TSW6 Free starter Packs on Steam, I tried to download TSW7 free Pack but I had to put in my card information so that it can make the payment of £0.00
I didn't know why it had to do that, But I put in my card Information anyway, and here's what it gave me:
It keeps on happening for some time now and I don't know how to fix this, any help?

 

Try clearing steam cache, exit out of steam, restart your pc, sign into steam again and try fresh.