Consumer Redressal

I had purchased an xperia z mobile , model no. C6602, on 16th april 2013. A month back its gorilla screen what they say got damaged internally without my fault , when I went to the service centre at vasai road they just said it wont be covered under warranty and said it would cost rs.13995 after confirming from their system. I posted the problem on Facebook pages of sony india and a person from sony itself said it will be done in warranty free of cost and to go and deposit the product at the service centre but still these people did not agree . I had no other option and so somehow I gathered the said amount of rs.13995 after a month and after reconfiming from the centre I prepared a demand draft of the said amount on the name of sony india pvt. Ltd. And deposited my phone with all accessories and now when everything is said and done they call me up again saying the amount to be paid is rs.16995 . I have been in trauma since I heard the amount of rs.13995