Consumer Redressal

I purchased a samsung galaxy S4 for Rs. 38200 on 29th may 2013...after 2 months only the battery of the set swelled up...i went to samsung service center as the set was not working properly and was getting restarted automatically service center people told without checking the phone it is your fault that battery was overcharged and swelled up.. next day i purchased new battery for 1000 rs then also same problem persisted..the battery was getting dipped and phone got restarted frequently..i again went to service center they told it is software problem...i deposited my set there for 3-4 days then got it back....again same night the same problem came up...i again went to service center....they told there is problem in phone\'s motherboard...i again deposited the set for one week...when i received the set still there was same problem....now again i have submitted my phone to service center and again they are saying it will be fine this time. I want complete closed box replacement or refund