Consumer Redressal

I purchased a micromax bolt series x 321 model mobile phone IMIE NO 1 : 911307408357413 and IMEI NO 2 :911307408357421 from BAG INFOTECH, Salkia, Howrah on 17/09/2013. It was noticed that that the top right key of the mobile phone stopped working properly and due to that I visited the authorized service centre at Howrah, kadamtala and they deposited the handset for few days and told me that it will be repaired within few days then I send one of my friend after few days to collect the handset then the service centre informed that the handset has been repaired.Then on 02/09/14 I send one of my staff to visit your another service centre in hatibagan named msc infotech after waiting for 2 hours where they informed that the keypad needs to be changed and it would not be provided with warranty and will be having a charge of Rs 255. they are saying all false commitment as not to provice warranty?both the service centre\'s words are not he same. kindly look into the matter.