Flipkart — IPhone 6s refurbished mobile dead

Website:

Flipkart.com

Hi sir ..i purchased iPhone 6s refurbished mobile from Flipkart, i used around 4 days, i got so many prblms in that mobile...1.battery draining fast
2.no battery backup

So I put for replacement, the replacement has scheduled and technician visit had been done, so i was waiting for replacement, but wish master didn't picked the mobile,
After I raised again compliment, the now mobile completely dead, second time tech visit done, but still mobile not yet recieved and wish master not picking the mobile and not delivered the replacement mobile .
From Flipkart response is not good