Airtel — inability to start connection after taking advance payment

Address:

Gautam Buddh Nagar, Uttar Pradesh, 201304

I paid in advance for 3 months (Rs. 2651) for wifi connection.
The airtel people came to my house at 11:00 am on monday, 9th oct '17, and did the wiring.
After that, from 12:30 pm to 5:30 pm they have been trying to start the connection and have been unable to do so.
4-5 people have been coming and going, dirtying our house, walking out without informing so the front door is wide open, and then saying there's "some problem".
Now, i spoke with the airtel rep for sector 74 noida - adesh chauhan - and he said that it can take indefinite time. He blatantly told me, "go ahead and complain if you want to".
I am completely frustrated because my mother is home alone and this is taking a toll on her.
Airtel has taken our money but is not able to give us the service that we paid for.