Consumer Redressal

I bought a Karbonn a9+ handset on July 6 2013 and as a handset bundle offer (HBO) offered by airtel, I was to get \"500MB 3G DATA, FOLLOWED BY UNLIMITED DATA USAGE PER MONTH FOR 6 MONTHS\" (Info available on airtel.in) HBO was credited but only 500mb 3g and as soon as they ended I was unable to access Internet on my number. I short \"UNLIMITED DATA USAGE PART OF THE OFFER IS MISSING\" I registered a complaint in this regard on 12th July 2013 and on 18 July an UNLIMITED DATA USAGE PACK (2g) was credited with 1 month validity. Next pack I received on August 23 2013. 500 mob 3g data ended and again I couldn\'t avail \"UNLIMITED DATA USAGE\" again I complained on 28 August 2013. This time they said that I\'m not eligible for the offer and asked for the purchase proof. I did that and again HBO was credited after 15 days delay on 12th September. 3g data lasted till 22nd September and again \" UNLIMITED DATA USAGE PART GOES MISSING\" Since then I\'ve complained many times but it goes unsolved. The desks I complained are: * airtel customer care 121 by call. * Nodal office: mail & call. *Airtel Appellate by mail & call. All these issues were about mobile number: 9797116971 I dunno where else to complain. Please tell me what should I do next.