Not getting coverage inside my home

Location/place: Kubernagar,ahmedabad

Name of company/service: TATA DOCOMO

I have two tata docomo numbers 9924304767, 8460055405 and there is severe issue of network problem(indoor i.e. Inside my home getting only one bar of network)as a result i am unable to send message sometime and surf internet on my pc.this is the problem for past 2 month. And tata docomo executive not providing any solution for this