Airtel — recharge has not done properly though given an offer

Address: East Godavari, Andhra Pradesh, 533221

I Had Received a msg from airtel network that get 1.4gb data /day and 10 gb extra for 84 days for 399 but credited 1gb /day only instead of 1.4 gb I made a call to customer service and gave my complaint and they replied that there is no such offer u better to contact [protected]@in.airtel.com