Apple India — iphone 7 no service issue

Address: Gurgaon, Haryana, 122001

I am lakshy kapoor and i have been using iphone7 since 2 years but suddenly i had started facing some issue with my phone so i had gone to apple service center, there they told me to restore my phone asper the instructions provided on apple website through itunes. I did restored my phone asper the apple guidelines. But soon after i restored my phone i have been facing the problem of no service in my phone even when my sim was there in my phone. I had gone to apple service center yet again for this problem but now they told me that i have a hardware issue in my phone and will have to pay them rs.30000 for replacement.