Khosla Eshoppe / Khosla Electronics — j7 pro

Address:

700110

Dear sir/madam,

I have purchased a j7 pro from khosla electronics at side pur b. T. Road on 9/04/2018. When they introduce the phone, there r a blue mark on the screen. They told me that it's a indicator light. But after returning home i searched online and found that it's a manufacturing fault. So what can i do now??? And they r also said that after selling the product we have no responsibility. I agree with her but the selling method is really wrong, that's way you cheat with me. Your kind attention is require...