eBay India Online Shopping Website — defective item received, replacement promised which never came

Address:

West Delhi, Delhi

I purchased a Samsung mobile cover worth Rs.349 from the ebay website.
IT WAS A SUCH A WASTE ITEM..TOTALLY DEFECTive.
started tearing off on the day i opened the packing and started using.

Sent e-mails to the website, they asked me to contact the seller. i contacted the seller...it was not reachable..neither through email or through phone.
then after giving a negative feedback, seller contacted me, negotiated with me for 30 minutes and promised me a replacement WHICH NEVER CAME.

again sent so many e-mails to the ebay....no response
WHEN i called their customer service....they were just not ready to listen..just said..madam...u r late...u should have informed earlier