Consumer Redressal

The mobile phone has been in the service centre for 3 months now and it has not been repaired till now. It is Karbonn A6 mobile. It carried the following problems: a) Keypad shows dots instead of alphababets and numbers. b) The phone hangs a lot c) One port of the phone was damaged since the audio was only coming from one side of the earphone. I tried different earphones and the poblem was the same. c) Voice is not good. I would like to tell that i bought this mobile on 11 June and from then it has been with me for only 15 days. for the rest of the period it has been with Karbonn service centre. I have send it to the centre three times and it has come back to me unrepaired.