Airtel — internet not working for 3 months

Address:

Bangalore, Karnataka, 560053

The internet is not working at our residence premise (Number[protected] for over 3 months now. The first complain given was on 3rd of november and the issue is not solved yet.
They make false commitments of solving the issue within 24 hours every time we call them, which is still not solved yet. Also, their technicians do not visit the premise even when promised that their technician will be visiting. It has happened 6-7 times that their technicians have not visited after making a commitment.
We would have nearly called them 20-30 times to escalate the issue and solve it. But, they do not take any action towards the same.
Also, they sometimes blame it on the customer that there is an internal wiring issue and sometimes on themselves that there is a problem with their wires. It's nearly been 3months since the internet is not working and still they are not doing anything to solve the issue.