Consumer Redressal

Microsoft Lumia 535 bought on 12.2.15 from the Microsoft Store at South City Mall. There was a touchpad problem for which it was given to the Microsoft Service Centre, Gariahat on 13.5.15. Its address is Infotel Services, Ekdalia Road, Near Evergreen Road, Kolkata - 700019. The jobsheet number was 265504886/150513/021. A letter was sent to them regarding this. We recd the handset on 16.7.15. On that very same day we found that the battery was not charging. So we gave it again to the same service centre on 20.7.15. Jobsheet number 265504886/150720/024. Pls help me out to get the replacement of my phone.