Consumer Redressal

I am a samsung user & purchased Samsung Grand phone on its launch in feb 2013 for 21500/-. I have visited Aditya Telecom centre which is an Authroized centre for samsung at Ashok Vihar phase 3 for problem in my display. There were some lines coming in display & the home key buttons & touch under that. the light on touch buttons sometime flash sometimes doesnt. My phone condition is brand new & has never been mishandled. I took the phone to service centre & after a thorough check by engineer (Rashid) he said display will be changed. I checked & confirmed abouts its warranty as there is no breakage at all. he said yes its covered. I submitted it friday 1st Nov & after check he returned me the phone saying there is no part availability. I rechecked on tue 5th Nov & he said you have to submit phone then only part will come. So i already wasted 4 days. I asked them why didn’t they take the phone on 1st then but with a stupid reply that part wouldn’t have come during diwali holidays. Atleast they would have taken phone & placed an order. anyway I resubmitted my phone on 6th nov. Now another engineer (Karan) checked my phone & he said display will be replaced. It was told it will be done on fri or max sat. But I kept waiting till next Monday. I checked yday morning 11th Nov about status & they said it will be done today eve or tue eve. But Monday eve I got a call form an engineer (Ashwani) who said you have to pay 8000/- Rs to get it replaced as we have found liquid formation in it. after 5 days they found water & usually engineers tell this while checking product. I asked them why didn’t they inform me on the first day itself. Why did they keep trying to to fix it. Now when they couldn’t find any error on my part so its water which is a common issue to mislead customers & warranty. I have taken extended warranty for the same but what’s the use of such warranty if service center guys after checking say such things. Now products come with liquid & damage warranty. if they would have told me about liquid thing on the first go I would have believed & they said we opened display now. Then what did they check when i submitted the phone.