Micromax Informatics — Warranty service not provided by micromax

Despite of taking all the precautions and care while using phone Micromax In note 1 which I purchased from flipkart is overheating a lot and when i gave the phone for repairing in service centre they refused to repair it without payment because of some water issue in phone and said its motherboard needs to be changed. I paid 11000 thousand rupees on this phone which became useless within 6months of its purchase despite o[censored]sing it properly.
There was issue of hearting from the very beginning and I even placed return but my replacement was not successful with flipkart and I ignored the problem but within 3-4 months the phone started overheating very fast as if it would burst? Who will take the responsibility when this company's phone bursting and harming the user.
And why should I pay 6 thousand for motherboard replacement without any fault and that too when its within warranty period