Netplus Broadband — Wifi Range Problem

Address:

128, Punjabi Bagh, Ambala Cantt

I have a netplus broadband connection, rs.499/- per month rent with 40 mbps speed and zte modem installed by team. But with this modem i cant get range in 20 feet, but in my neighbour all broadband connction range display in my mobile. I have complaint to local distributor, his service team, customer care but they all failed. They are not help me in this matter. Owner said u cant get range in your next room due to wall. But when i try to connect with neighbours wifi connection all are working fine. I am helpless please help me.