Trendcarpet - smelling like cat pee

Bought from Trendcarpet (340cmx240cm):

https://www.trendcarpet.no/no/ryetepper/ryetepper-monti-offwhite/

A couple of problems with the carpet, which are reasons to sell it much cheaper:

1) It smells like cat pee. I have tried to clean it as much as I could, but an odor remains, more evident on humid days

2) The area of the carpet that was hidden underneath the sofa is whiter than the rest - as seen on the photos

Must be picked up.