Reliance Bigtv — after six months of advance payment still not got connection installed

Address:

421002

Congratulations! For booking your rbig tv connection. Installation will be done between 30 to 45 days. Your booking id is 12503891 and no of connections 1...
This is the initial comnittment of the company when i booked with 500 rs payment in advance but still i not get the product installed please convey my compkaint to higher authorities so that i will get connection or refund with interest