Airtel — broadband connection fraud and no refund

Address:	Mumbai City, Maharashtra, 400058
Website:	www.airtel.in/broadband/chennai?utm_source=pfx_google_search_broadband_brand_ROI&utm_content=bro

Hi
I am from andheri west mumbai.
I had applied for a broadband connection a few months ago and the airtel technician visited my house. They confirmed all my documentation and asked for installation fee that. I paid them and they said the connection would be done in the next 2 days. No thing happens and my money is not even refunded. When i call the customer care service, they hang up on me.
Please help