Amazon India — DOA Replacement Denied

I bought an Asus laptop from amazon which was defective on arrival. I requested for replacement and they denied it while it was on replacement window. Then i contacted asus service center and they issued a DOA certificate for the product which i am supposed to forward to amazon and get replacement, but i am still denied for replacement, while the same product of same seller is still sold on amazon. I contacted amazon multiple times via call and email, they still cant solution for my issue.