Airtel — replacement of sim but registration on network failure

Address:

Nellore, Andhra Pradesh

My old sim was broken and i asked for the replacement and was given a new sim and told it would get activated within 2hrs but it has been more than 1week not yet activated and that sim on the phone is displaying the error as not registered on network.I was not able to contact to the customer care to raise the complaint and check the status of the sim. Please respond quick as most of my banking is linked over to the sim.