ACT Fibernet — wrong installation/refund needed

Address: Hyderabad, Telangana, 500084

Have purchased six months plan from act. They have provided faulty connection.
Now they are not responding to my calls messages or emails. I have not been able to use single byte of data. And my validity period is going on. I want to disconnect and refund. The registration guy has threatened that the installation is over
And he wont do anything. The technician said that the network will come automatically. But i got it checked by other guy who said the wire is not connected. They have not provided the complete setup. And they have charged 4300. I dont know what to do. I am a new guy in the city. This is my worst experience ever. I am not a rich guy. Please help..