Sony India — I m complaining about my sony vaio fit 13

Address:	Amritsar, Punjab, 143001
Website:	sony.co.in

I bought a sony vaio laptop fit 13 model no-svf13n1asns in5 on 01/05/2014... Job sheet number is - j61592080 and i also bought 3 yr extended warranty..2-3 months ago my laptop started giving me some problems.. There was heating problem along with high noise of fan and the charging point was not working properly.. Side beneath the battery started bulging out due to unknown reasons.. So on 05/07/2016 i took my laptop to sony service station which is located at national shopping complex near nandan cinema chowk amritsar.. They gave me a time span of 1 week.. After 10 days i got a call from sony that my laptop had been repaired and i can take that... So the next day i went to service station and was checking my laptop when i noticed that the bulge underneath laptop was still there and login password had been changed... Os was changed to windows 8 (As i gave the laptop with windows 10)
I told them my problems... Again they said that they will look into matter.. After two days 1 received a call that i can take my laptop back.. Again i went to service center and noticed that the bulge was still there and there was login password to the os.. I asked them about that.. They said the bulge could be due to physical damage and they didn't touch the software part.. But there was no sign of physical damage as it was due to extreme heating of laptop body.. Now they are saying that they cant do anything about it.. It wasnt my fault and it is not due to physical damage.. They are saying that it is not included in warranty.. The problem is due to their hardware issues and they are not solving..