Lenovo Vibe S1 — Unable to receive calls in a specific location

Address:

Bangalore, Karnataka, 560075

I'm unable to receive calls from my home. Whereas when I step out of my home I can receive calls. I contacted my network operator and they said this is not a network issue, as Im able to receive calls in the same sim from another phone. The phone earlier had issues with the data connection, the data would work only in the secure zone. And I had to factory reset my phone to resolve that issue. Now I'm unable to receive calls.
Please help me to resolve this issue.