Reliance Bigtv — reliance big tv pre booking scam

I did pre booking for reliance big tv on march 1st and it was promised that the installing will be done within 45 days. Now its more than 45 days and they are not responding to the calls. Their customer care service number always comes busy.

I need my money back with compensation for such a big fraud. How can reliance do this to there customers. Everyone who are facing this issue should register complaint against them in social media