What do you mean defective? Do you mean the lines across the face? Have you spoken to the distributor? Reached out to the manufacturer?

Here's an excerpt from the Reward Flooring installation instructions regarding inspection:

" It is the installer’s responsibility to inspect the flooring for proper color, grade, visible manufacturing defects, damage, or otherwise unsatisfactory appearance. Upon receipt of the flooring, open 1-2 cartons to inspect and confirm with the job supervisor AND the homeowner/end-user that the material is satisfactory. If any problem is found, do not open any additional cartons. Other than the first 1-2 that must be opened to check the material, open cartons are not returnable. Contact your local retailer or distributor immediately. Do not install damaged or visibly unsatisfactory material. Installing a plank constitutes acceptance of its appearance by the installer and homeowner/end-user."