Flipkart — Defective laptop and denying replacements

The laptop I bought from Flipkart order noOD[protected] defective so I requested a replacement then the technician came and issued a dead on arrival certificate but Flipkart rejected the replacement request and i have placed another replacement request and contacted Flipkart and uploaded the doa certificate.Flipkart told me that there backend team cancelled my replacement as my reason is not sufficient (the laptop is not powering on) ..infact they are delaying the process I have already filed a complaint with national consumer helpline