Redmi — Redmi 1s handset

I purchased redmi 1s mobile from ebay.in for rs 5798 on may 11 2015 the seller agreed 6 months warranty on the product After using for 2 months the mobile's battery life reduced and became very worst and its condition became slow And after 3 montgs the data cable and charger is not working I complained regard this many times for ebay.in and redmi but their is no proper response and the seller does not replaied for my requests So please check it out and resolve my problem Thanking you