Samsung — Worst after sale service for my samsung mobile

My phone Samsung S duos GT-S7562 is under warranty. I have spent Rs. 15000/- for the phone. I have submitted my phone for two times for the same problem lines on LCD displayand slow working. Samsung kept my phone for more than two weeks both the time and failed to give committed service. I asked samsung that is the model I purchased is faulty? Is the part not manufactured on large scale for my model? Is Samsung compulsory required more than 15 days to solve any problem especially in Mega Metro like Mumbai? What will happen if the same or any other problem occurred after warranty period when I am getting such harassment in warranty period? Should I always have to call or email service center to get my phone back or to get feedback, Samsung don’t have any call/sms system? I have submitted detail on Samsung website to track my phone status. But my complaint is not registered on Samsung network to track the status neither it was found to samsung officials who called me from Samsung. My city doesn’t have any official service facility. The nearest service station available is at 70 km from Dapoli i. e. Chiplun and if any problem occurred in future I have to visit there only for repair which is not economical for me. Presently my mobile is in samsung customer care in Malad Mumbai with no repair from last 18 days. If it is not possible to rectify the problem I asked samsung to give me a new phone of the same cost of different model with duel sim having no faults and availability of spare parts. I request you samsung not to give my same phone back with the issues with the remaining warranty period. But they are not giving positive reply and taking tie to delay the case. I hope to see your positive reply at earliest. Mahesh M kulkarni [protected]