Samsung — They are changing amount of 9000/-during my warranty also

Address:

West Delhi, Delhi

Hi ,
I got a Samsung Galaxy Note in July'2012 ,so according to the company my phone is in warranty period ,as it have not yet completed a year .Recently , I started facing a problem in the phone i.e.a key shtopped working ,so when when to there Patel nagar Samsung service station ,they checked it and told me that for the repair I would have to pay them a amount of 9000/- as it have got some liquid damage , so I took my phone back , now I am not getting ny answers from the customer care deptt. as in why do I have to pay any amount of my phone is in warranty .Kindly help me with the same .

Regards
Akanksha