Karbonn Mobiles — mobile phone

Address:

Ghaziabad, Uttar Pradesh

I purchased a Karbon A5 mobile on 17 aug 2012. Within days, the proximity sensor stopped working (on making a call display get off and doesn't come back). I went for repair it on 25 aug2012. After so many today and tomorrows i finally got it back on 06 sept 2012. From the next day onwards again it's proximity sensor is not working.
I want either the new mobile or my money back.

Arvind