Siti Broadband — No connection in Night time

Address:

Chandanpur, Hooghly

I am using Siti broadband and the connection is very very poor in my area (Chandanpur, Singur, Hooghly).

After 11 pm each night, no connection is there. We are very much disappointed in this area with this issue, as most of we are working from home at this time.
We have already complained the same to local support but as per them, they are not getting connection from upstream.
Please look into this.