not providing new baterry

sir i have buy auxus stunner from ebay as i buy my phone after 6monts mobile battery physical condision of my mobile battery had change so i firt email about replace to ebay from thery mail comes that contact iberry support for your problem i contact to iberry support for my problem they said that we did not have stock of battery plz call in 10 to 15 days and next time when i called to iberrry suport they again said for 10 too 15 days and now 1 month is passed but i didnt get any response for iberry i had also request them for refund but they said they cant refund thery products sir mobile is still in warranty then also iberry care is not helping me i had paid 14000 for my iberry auxus syunner then also iberry company is not helping me plz sir plz help me with my problem
waiting for your quick responce your faithful
ashit shah