Airtel — Not installing after taking money

Address: CDA SECTOR 9

I got call from Airtel Black and I agreed to the plan for three months. They asked me to pay 1000/- before for pre booking. I have paid. They said engineer will call, no body has called in more than 12 hours now. The number of the person that I am given, he received call once and said that some other person will take care, and it was by mistake assigned to him. No other person has called me and even the person assigned to me is not picking up the call now. No one is responsive and there is no follow back. How is this justified to be reachable while taking money but not providing any service after that? Kindly get back on the installation or refund my money.