Alliance — no action in spite of complains indecent behaviour

Address:

23A SUREN SARKAR ROAD KOLKATA-700010

I have contacted the local service provider trusted broadband but they no not pay attention to our calls and has avery indecent behaviour. Instead they say to change the service provider, which is also not possible as the y have made a monopoly market and would not allow other service provider to provide the connection.
Please help as my work is getting hampered