Advaith Hyundai Service, Mission Road, Bangalore — Unresolved problem, poor attitudes

Address:	560064
Website:	??????

I am a owner of Sonata(2013) purchased from Advaith Hyundai. I took my vehicle to Advaith Hyundai, Mission road, Bangalore on 28/10/2015 for a 3rd free service. Once it is free service, the approach is casual. I complained about non working of air conditioner for the rear seats. The service is awful and not satisfactory. The problem of air conditioning for the rear seats remains unresolved. The vehicle is under warranty. They asked me take the vehicle( after keeping the vehicle for more than more than 30 hours. They assured to get back after comparing with a new vehicle !! . They have no clue about the vehicle. They do certain routine things like engine oil changing, wheel alignment and charge even for free service. How can I be helped ?