Intex Mobile — Not repairing my mobile and bad behaviour

date of incident- 31 july 2015
i own an intex aqua xtreme mobile. it is six month old. it has a battery problme battery swelled. it has inbuilt battery . i give the mobile for repairing on 10th july . they said they do it in 7 days . i went there on 20th july. but they said it has some screen and other issues . but since i am using it does not had any issues. noe i went again on 31st july they said it will take 20 days more. they dont let me tell about my problem accurately. didnt pick up my calls . provides me wrong info. and they also not repaired my cell proprely and it got issue due to their irresponsibility.