Micromax — Regarding repair of mobile phone a99

Recently I have bought a micromax a99 mobile phone and I have given it for repair with in warrantee in Noida to satguru communications who is authorized service center of micromax on 27th July 2015. They said it would take more than a week to deliver the product back. Its been more than three weeks and today is 13th August 2015. When I call they don't respond properly on phone and they ignore what customer says. the repair center fellow says there is no stock in their inventory of the screen which is faulty and which has to be changed. What kind of service are you giving to your customers micromax? and do you want your customers to regret for buying your faulty pieces? and are your QA/QC people sleeping all the day at your offices? ticket id is 27241