Income tax return a.y. 13-14

Dear Friends,

Please help and guide me i am NRI in financial year 2012-13 (a.y. 13-14) and e-file the income tax return on 22.07.2014 with Gross income 639624.00.that time auto generated ITRV not shown any tax liability. Now i received demand letter from income tax of Rs. 80340.00 I check clearly i mention my NRI status in the return. As i know NRI income is fully exempted.

Please advice me on this joshi_somnath @ ymail.com As well as whatsup 00971529583810