Missing product in my order at www.nike.com

Hello,

I just received my order that I placed on the website https://www.nike.com/fr/fr_fr/
Unfortunately, the contents of the package do not include the entirety of my order.
I ordered a tracksuit and only the jacket is included; the pants are missing.
I couldn't find on their website how to file a complaint.
Could someone help me by indicating how to proceed to make a complaint, for example?
Thank you in advance.